Sync package lock for Node 24

.env.example

@@ -19,6 +19,7 @@ BITCOIN_RPC_COOKIEFILE=
 
 API_PORT=3334
 STRATUM_PORT=3333
+STRATUM_MAX_CONNECTIONS_PER_LISTENER=10000
 
 #optional telegram bot
 #TELEGRAM_BOT_TOKEN=

.npmrc

@@ -0,0 +1 @@
+omit=optional

Dockerfile

@@ -2,7 +2,7 @@
 # Docker build environment #
 ############################
 
-FROM node:22.11.0-bookworm-slim AS build
+FROM node:24.16.0-bookworm-slim AS build
 
 # Upgrade all packages and install dependencies
 RUN apt-get update \
@@ -26,7 +26,7 @@ RUN npm i && npm run build
 # Docker final environment #
 ############################
 
-FROM node:22.11.0-bookworm-slim
+FROM node:24.16.0-bookworm-slim
 
 # Expose ports for Stratum and Bitcoin RPC
 EXPOSE 3333 3334 8332

README.md

@@ -45,6 +45,20 @@ Install pm2 (https://pm2.keymetrics.io/)
 $ pm2 start dist/main.js
 ```
 
+When running the worker app in PM2 cluster mode, start the PM2 daemon with OS-level
+connection scheduling. The environment variable must be present when the PM2 daemon
+starts, not only in the worker configuration.
+
+```bash
+$ NODE_CLUSTER_SCHED_POLICY=none pm2 start ecosystem.config.js
+```
+
+Cluster-mode connection dropping requires Node.js `22.12.0` or newer.
+
+`STRATUM_MAX_CONNECTIONS_PER_LISTENER` is enforced per worker and Stratum port.
+Size it using the busiest port: `worker count * limit`. For example, 28 workers
+with the default limit of `10000` allow up to `280000` connections on one port.
+
 ## Docker
 
 Build container:

package.json

@@ -5,6 +5,9 @@
   "author": "",
   "private": true,
   "license": "UNLICENSED",
+  "engines": {
+    "node": ">=22.12.0"
+  },
   "scripts": {
     "build": "nest build",
     "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
@@ -21,60 +24,59 @@
     "test:e2e": "jest --config ./test/jest-e2e.json"
   },
   "dependencies": {
-    "@nestjs/axios": "^3.0.0",
-    "@nestjs/cache-manager": "^2.0.1",
-    "@nestjs/common": "^9.0.0",
-    "@nestjs/config": "^2.3.2",
-    "@nestjs/core": "^9.0.0",
-    "@nestjs/platform-fastify": "^9.4.2",
-    "@nestjs/schedule": "^3.0.1",
-    "@nestjs/typeorm": "^10.0.0",
-    "axios": "^1.4.0",
-    "big.js": "^6.2.1",
-    "bitcoin-address-validation": "^2.2.1",
-    "bitcoinjs-lib": "^6.1.3",
-    "bitcoinjs-message": "^2.2.0",
+    "@nestjs/axios": "^4.0.1",
+    "@nestjs/cache-manager": "^3.1.2",
+    "@nestjs/common": "^11.1.19",
+    "@nestjs/config": "^4.0.4",
+    "@nestjs/core": "^11.1.19",
+    "@nestjs/platform-fastify": "^11.1.19",
+    "@nestjs/schedule": "^6.1.3",
+    "@nestjs/typeorm": "^11.0.1",
+    "axios": "^1.16.0",
+    "bitcoin-address-validation": "^2.2.3",
+    "bitcoinjs-lib": "^6.1.7",
     "bs58": "^5.0.0",
-    "cache-manager": "^5.2.3",
+    "cache-manager": "^7.2.8",
     "class-transformer": "^0.5.1",
-    "class-validator": "^0.14.0",
-    "discord.js": "^14.11.0",
+    "class-validator": "^0.14.4",
+    "discord.js": "^14.26.4",
     "merkle-lib": "^2.0.10",
-    "node-telegram-bot-api": "^0.61.0",
-    "reflect-metadata": "^0.1.13",
-    "rpc-bitcoin": "^2.0.0",
-    "rxjs": "^7.2.0",
     "sqlite3": "^5.1.6",
-    "tiny-secp256k1": "^2.2.3",
-    "typeorm": "^0.3.17",
+    "reflect-metadata": "^0.2.2",
+    "rxjs": "^7.8.2",
+    "tiny-secp256k1": "^2.2.4",
+    "typeorm": "^0.3.28",
     "zeromq": "6.0.0-beta.19"
   },
   "devDependencies": {
-    "@nestjs/cli": "^9.0.0",
-    "@nestjs/schematics": "^9.0.0",
-    "@nestjs/testing": "^9.0.0",
-    "@types/big.js": "^6.1.6",
+    "@nestjs/cli": "^11.0.21",
+    "@nestjs/schematics": "^11.1.0",
+    "@nestjs/testing": "^11.1.19",
     "@types/cron": "^2.0.1",
-    "@types/express": "^4.17.13",
-    "@types/jest": "29.5.1",
-    "@types/node": "^18.16.12",
-    "@types/node-telegram-bot-api": "^0.61.6",
-    "@types/supertest": "^2.0.11",
+    "@types/express": "^4.17.25",
+    "@types/jest": "^29.5.14",
+    "@types/node": "^18.19.130",
+    "@types/supertest": "^7.2.0",
     "@typescript-eslint/eslint-plugin": "^5.0.0",
     "@typescript-eslint/parser": "^5.0.0",
     "eslint": "^8.0.1",
-    "eslint-config-prettier": "^8.3.0",
-    "eslint-plugin-prettier": "^4.0.0",
-    "jest": "29.5.0",
-    "patch-package": "8.0.0",
-    "prettier": "^2.3.2",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-prettier": "^5.5.5",
+    "jest": "^29.7.0",
+    "patch-package": "^8.0.1",
+    "prettier": "^3.8.3",
     "source-map-support": "^0.5.20",
-    "supertest": "^6.1.3",
-    "ts-jest": "29.1.0",
-    "ts-loader": "^9.2.3",
-    "ts-node": "^10.0.0",
+    "supertest": "^7.2.2",
+    "ts-jest": "^29.4.9",
+    "ts-loader": "^9.5.7",
+    "ts-node": "^10.9.2",
     "tsconfig-paths": "4.2.0",
-    "typescript": "^5.0.0"
+    "typescript": "^5.9.3"
+  },
+  "overrides": {
+    "@fastify/middie": "^9.3.2",
+    "fastify": "^5.8.5",
+    "path-to-regexp": "^8.4.2"
   },
   "jest": {
     "moduleFileExtensions": [

patches/rpc-bitcoin+2.0.0.patch

@@ -1,26 +0,0 @@
-diff --git a/node_modules/rpc-bitcoin/build/src/rpc.d.ts b/node_modules/rpc-bitcoin/build/src/rpc.d.ts
-index d25d732..ce4eb22 100644
---- a/node_modules/rpc-bitcoin/build/src/rpc.d.ts
-+++ b/node_modules/rpc-bitcoin/build/src/rpc.d.ts
-@@ -6,7 +6,7 @@ export declare type RPCIniOptions = RESTIniOptions & {
-   fullResponse?: boolean;
- };
- export declare type JSONRPC = {
--  jsonrpc?: string | number;
-+  jsonrpc?: string;
-   id?: string | number;
-   method: string;
-   params?: object;
-diff --git a/node_modules/rpc-bitcoin/build/src/rpc.js b/node_modules/rpc-bitcoin/build/src/rpc.js
-index 7fec7aa..3bee5fc 100644
---- a/node_modules/rpc-bitcoin/build/src/rpc.js
-+++ b/node_modules/rpc-bitcoin/build/src/rpc.js
-@@ -12,7 +12,7 @@ class RPCClient extends rest_1.RESTClient {
-   }
-   async rpc(method, params = {}, wallet) {
-     const uri = typeof wallet === "undefined" ? "/" : "wallet/" + wallet;
--    const body = { method, params, jsonrpc: 1.0, id: "rpc-bitcoin" };
-+    const body = { method, params, jsonrpc: "1.0", id: "rpc-bitcoin" };
-     try {
-       const response = await this.batch(body, uri);
-       return this.fullResponse ? response : response.result;

src/ORM/address-settings/address-settings.service.ts

@@ -31,6 +31,24 @@ export class AddressSettingsService {
         return await this.addressSettingsRepository.update({ address }, { bestDifficulty, bestDifficultyUserAgent });
     }
 
+    public async updateBestDifficultyIfHigher(address: string, bestDifficulty: number, bestDifficultyUserAgent: string) {
+        await this.addressSettingsRepository
+            .createQueryBuilder()
+            .insert()
+            .into(AddressSettingsEntity)
+            .values({ address })
+            .orIgnore()
+            .execute();
+
+        return await this.addressSettingsRepository
+            .createQueryBuilder()
+            .update(AddressSettingsEntity)
+            .set({ bestDifficulty, bestDifficultyUserAgent })
+            .where('address = :address', { address })
+            .andWhere('"bestDifficulty" < :bestDifficulty', { bestDifficulty })
+            .execute();
+    }
+
     public async getHighScores() {
         return await this.addressSettingsRepository.createQueryBuilder()
             .select('"updatedAt", "bestDifficulty", "bestDifficultyUserAgent"')
@@ -54,9 +72,13 @@ export class AddressSettingsService {
     }
 
     public async resetBestDifficultyAndShares() {
-        return await this.addressSettingsRepository.update({}, {
-            shares: 0,
-            bestDifficulty: 0
-        });
+        return await this.addressSettingsRepository
+            .createQueryBuilder()
+            .update(AddressSettingsEntity)
+            .set({
+                shares: 0,
+                bestDifficulty: 0
+            })
+            .execute();
     }
 }

src/ORM/client-statistics/client-statistics.service.ts

@@ -252,6 +252,6 @@ export class ClientStatisticsService {
     }
 
     public async deleteAll() {
-        return await this.clientStatisticsRepository.delete({})
+        return await this.clientStatisticsRepository.clear()
     }
 }

src/ORM/client/client.service.ts

@@ -1,7 +1,7 @@
 import { Injectable } from '@nestjs/common';
 import { Interval } from '@nestjs/schedule';
 import { InjectRepository } from '@nestjs/typeorm';
-import { BehaviorSubject, firstValueFrom } from 'rxjs';
+import { firstValueFrom, Subject } from 'rxjs';
 import { ObjectLiteral, Repository } from 'typeorm';
 
 import { ClientEntity } from './client.entity';
@@ -12,7 +12,7 @@ import { ClientEntity } from './client.entity';
 export class ClientService {
 
 
-    public insertQueue: { result: BehaviorSubject<ObjectLiteral | null>, partialClient: Partial<ClientEntity> }[] = [];
+    public insertQueue: { result: Subject<ObjectLiteral>, partialClient: Partial<ClientEntity> }[] = [];
 
 
     constructor(
@@ -27,11 +27,21 @@ export class ClientService {
         const queueCopy = [...this.insertQueue];
         this.insertQueue = [];
 
-        const results = await this.clientRepository.insert(queueCopy.map(c => c.partialClient));
+        if (queueCopy.length === 0) {
+            return;
+        }
 
-        queueCopy.forEach((c, index) => {
-            c.result.next(results.generatedMaps[index]);
-        });
+        try {
+            const results = await this.clientRepository.insert(queueCopy.map(c => c.partialClient));
+
+            queueCopy.forEach((c, index) => {
+                c.result.next(results.generatedMaps[index]);
+                c.result.complete();
+            });
+        } catch (e) {
+            queueCopy.forEach(c => c.result.error(e));
+            throw e;
+        }
     }
 
     public async killDeadClients() {
@@ -56,7 +66,7 @@ export class ClientService {
 
     public async insert(partialClient: Partial<ClientEntity>): Promise<ClientEntity> {
 
-        const result = new BehaviorSubject(null);
+        const result = new Subject<ObjectLiteral>();
 
         this.insertQueue.push({ result, partialClient });
 
@@ -93,6 +103,17 @@ export class ClientService {
     public async updateBestDifficulty(sessionId: string, bestDifficulty: number) {
         return await this.clientRepository.update({ sessionId }, { bestDifficulty });
     }
+
+    public async updateBestDifficultyIfHigher(sessionId: string, bestDifficulty: number) {
+        return await this.clientRepository
+            .createQueryBuilder()
+            .update(ClientEntity)
+            .set({ bestDifficulty })
+            .where('sessionId = :sessionId', { sessionId })
+            .andWhere('"bestDifficulty" < :bestDifficulty', { bestDifficulty })
+            .execute();
+    }
+
     public async connectedClientCount(): Promise<number> {
         return await this.clientRepository.count();
     }
@@ -126,7 +147,10 @@ export class ClientService {
     }
 
     public async deleteAll() {
-        return await this.clientRepository.softDelete({})
+        return await this.clientRepository
+            .createQueryBuilder()
+            .softDelete()
+            .execute();
     }
 
     public async getUserAgents() {

src/controllers/address/address.controller.ts

@@ -1,5 +1,4 @@
 import { Controller, Patch } from '@nestjs/common';
-import * as bitcoinMessage from 'bitcoinjs-message';
 
 
 @Controller('address')
@@ -7,16 +6,6 @@ export class AddressController {
 
     @Patch('settings')
     async settings() {
-
-        const publicKey = '...'; // Public key corresponding to the private key used for signing
-        const message = '...'; // The message that was signed
-        const signature = '...'; // The signature of the message
-
-        const isValid: boolean = bitcoinMessage.verify(message, publicKey, signature);
-        if (isValid) {
-            console.log('Signature is valid!');
-        } else {
-            console.log('Signature is not valid!');
-        }
+        return;
     }
 }

src/controllers/client/client.controller.spec.ts

@@ -14,7 +14,7 @@ describe('ClientController', () => {
       imports: [
         TypeOrmModule.forRoot({
           type: 'sqlite',
-          database: './DB/public-pool.test.sqlite',
+          database: ':memory:',
           synchronize: true,
           autoLoadEntities: true,
           cache: true,

src/models/MiningJob.spec.ts

@@ -1,9 +1,12 @@
-import { ConfigService } from "@nestjs/config";
+import { ConfigService } from '@nestjs/config';
+import { Test, TestingModule } from '@nestjs/testing';
 import * as bitcoinjs from 'bitcoinjs-lib';
-import { Test, TestingModule } from "@nestjs/testing";
-import { MiningJob } from "./MiningJob";
-import { IJobTemplate } from "../services/stratum-v1-jobs.service";
+import { BehaviorSubject, firstValueFrom } from 'rxjs';
 
+import { MockRecording1 } from '../../test/models/MockRecording1';
+import { IMiningInfo } from './bitcoin-rpc/IMiningInfo';
+import { IJobTemplate, StratumV1JobsService } from '../services/stratum-v1-jobs.service';
+import { MiningJob } from './MiningJob';
 
 function hexToAscii(hex: string): string {
     let ascii = '';
@@ -46,12 +49,7 @@ describe('MiningJob', () => {
                 {
                     provide: ConfigService,
                     useValue: {
-                        get: jest.fn((key: string) => {
-                            switch (key) {
-                                // Configure mock responses for ConfigService
-                            }
-                            return null;
-                        })
+                        get: jest.fn(() => null)
                     }
                 }
             ],
@@ -59,11 +57,11 @@ describe('MiningJob', () => {
         configService = moduleRef.get<ConfigService>(ConfigService);
     });
 
-
     describe('constructor', () => {
         beforeEach(() => {
 
             console.warn = jest.fn((message: string) => console.log('WARN:', message));
+            configService.get = jest.fn(() => null);
             payoutInformation = [
                 {
                     address: 'tb1qr2ylpdgp9ejpt6v2uxlqrn9penp82rzz2grnns',
@@ -83,8 +81,10 @@ describe('MiningJob', () => {
 
             jobTemplate = {
                 block: block,
+                merkle_branch: [],
                 blockData: {
                     id: '1',
+                    creation: Date.now(),
                     coinbasevalue: 0,
                     networkDifficulty: 0,
                     height: 0,
@@ -92,6 +92,11 @@ describe('MiningJob', () => {
                 }
             } as IJobTemplate;
         });
+
+        afterEach(() => {
+            jest.restoreAllMocks();
+        });
+
         it('should create a new MiningJob if POOL_IDENTIFIER is not set and use the default', () => {
             const expectedMiningIdentifier = 'Public-Pool';
             expect(jobTemplate.block).toBeDefined();
@@ -144,7 +149,7 @@ describe('MiningJob', () => {
         it('should use the POOL_IDENTIFIER if it doesn\'t make the script size too big with identifier abcabc', () => {
 
             jobTemplate.block.transactions = []; // remove transactions because we only want to test the script size
-            const expectedMiningIdentifier = 'A'.repeat(88); // 88 chars is the maximum size validated against bitcoin core in regtest
+            const expectedMiningIdentifier = 'A'.repeat(84); // 84 chars fits after reserving 12 bytes for extranonce space
             configService.get = jest.fn((key: string) => {
                 switch (key) {
                     case 'POOL_IDENTIFIER': return expectedMiningIdentifier;
@@ -165,7 +170,7 @@ describe('MiningJob', () => {
             jobTemplate.block.transactions = []; // remove transactions because we only want to test the script size
             configService.get = jest.fn((key: string) => {
                 switch (key) {
-                    case 'POOL_IDENTIFIER': return 'A'.repeat(89); // 88 chars is the maximum size validated against bitcoin core in regtest
+                    case 'POOL_IDENTIFIER': return 'A'.repeat(85);
                 }
                 return null;
             });
@@ -178,4 +183,113 @@ describe('MiningJob', () => {
             expect(miningIdentifier).toBe(expectedMiningIdentifier);
         });
     });
+
+    describe('block updates', () => {
+        let job: MiningJob;
+
+        beforeEach(async () => {
+            jest.useFakeTimers();
+            jest.setSystemTime(new Date(parseInt(MockRecording1.TIME, 16) * 1000));
+            configService.get = jest.fn(() => null);
+
+            const miningInfo$ = new BehaviorSubject<IMiningInfo>({
+                blocks: MockRecording1.BLOCK_TEMPLATE.height
+            } as IMiningInfo);
+            const bitcoinRpcService = {
+                newBlock$: miningInfo$.asObservable(),
+                getBlockTemplate: jest.fn().mockResolvedValue(MockRecording1.BLOCK_TEMPLATE)
+            };
+            jest.spyOn(console, 'log').mockImplementation(() => undefined);
+
+            const jobsService = new StratumV1JobsService(bitcoinRpcService as any);
+            jobTemplate = await firstValueFrom(jobsService.newMiningJob$);
+            job = new MiningJob(
+                configService,
+                bitcoinjs.networks.testnet,
+                '1',
+                [{ address: 'tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4', percent: 100 }],
+                jobTemplate
+            );
+        });
+
+        afterEach(() => {
+            jest.restoreAllMocks();
+            jest.useRealTimers();
+        });
+
+        it('should split coinbase around 12 bytes of extranonce space', () => {
+            const notify = JSON.parse(job.response(jobTemplate));
+            const coinbasePart1 = notify.params[2];
+            const coinbasePart2 = notify.params[3];
+            const extraNonce1 = '57a6f098';
+            const extraNonce2 = 'c708000000000000';
+            const coinbase = bitcoinjs.Transaction.fromHex(`${coinbasePart1}${extraNonce1}${extraNonce2}${coinbasePart2}`);
+
+            expect(Buffer.byteLength(extraNonce1 + extraNonce2, 'hex')).toBe(12);
+            expect(coinbase.ins[0].script.toString('hex')).toContain(`${extraNonce1}${extraNonce2}`);
+            expect(coinbase.ins[0].script.toString('hex').endsWith(`${extraNonce1}${extraNonce2}`)).toBe(true);
+        });
+
+        it('should update block nonce, timestamp, version mask, and coinbase script', () => {
+            const extraNonce1 = '57a6f098';
+            const extraNonce2 = 'c708000000000000';
+            const timestamp = parseInt(MockRecording1.TIME, 16);
+            const originalMerkleRoot = Buffer.from(jobTemplate.block.merkleRoot);
+
+            const updatedBlock = job.copyAndUpdateBlock(
+                jobTemplate,
+                parseInt('00002000', 16),
+                parseInt('ed460d91', 16),
+                extraNonce1,
+                extraNonce2,
+                timestamp
+            );
+
+            expect(updatedBlock.nonce).toBe(parseInt('ed460d91', 16));
+            expect(updatedBlock.timestamp).toBe(timestamp);
+            expect(updatedBlock.version).toBe(jobTemplate.block.version ^ parseInt('00002000', 16));
+            expect(updatedBlock.transactions[0].ins[0].script.toString('hex').endsWith(`${extraNonce1}${extraNonce2}`)).toBe(true);
+            expect(updatedBlock.merkleRoot.equals(originalMerkleRoot)).toBe(false);
+        });
+
+        it('should leave block version unchanged without a version mask', () => {
+            const updatedBlock = job.copyAndUpdateBlock(
+                jobTemplate,
+                0,
+                parseInt('ed460d91', 16),
+                '57a6f098',
+                'c708000000000000',
+                parseInt(MockRecording1.TIME, 16)
+            );
+
+            expect(updatedBlock.version).toBe(jobTemplate.block.version);
+        });
+
+        it('should build the same header as the full block update path', () => {
+            const versionMask = parseInt('00002000', 16);
+            const nonce = parseInt('ed460d91', 16);
+            const extraNonce1 = '57a6f098';
+            const extraNonce2 = 'c708000000000000';
+            const timestamp = parseInt(MockRecording1.TIME, 16);
+
+            const updatedBlock = job.copyAndUpdateBlock(
+                jobTemplate,
+                versionMask,
+                nonce,
+                extraNonce1,
+                extraNonce2,
+                timestamp
+            );
+            const fastHeader = job.buildHeaderBuffer(
+                jobTemplate,
+                versionMask,
+                nonce,
+                extraNonce1,
+                extraNonce2,
+                timestamp
+            );
+
+            expect(fastHeader.equals(updatedBlock.toBuffer(true))).toBe(true);
+        });
+    });
 });

src/models/MiningJob.ts

@@ -5,6 +5,7 @@ import { IJobTemplate } from '../services/stratum-v1-jobs.service';
 import { eResponseMethod } from './enums/eResponseMethod';
 import { IMiningNotify } from './stratum-messages/IMiningNotify';
 import { ConfigService } from '@nestjs/config';
+import { TOTAL_EXTRANONCE_SIZE_BYTES } from './stratum.constants';
 
 const MAX_BLOCK_WEIGHT = 4000000;
 const MAX_SCRIPT_SIZE = 100; //   https://github.com/bitcoin/bitcoin/blob/ffdc3d6060f6e65e69cf115a13b83e6eb4a0a0a8/src/consensus/tx_check.cpp#L49
@@ -17,6 +18,9 @@ export class MiningJob {
     private coinbaseTransaction: bitcoinjs.Transaction;
     private coinbasePart1: string;
     private coinbasePart2: string;
+    private coinbasePart1Buffer: Buffer;
+    private coinbasePart2Buffer: Buffer;
+    private merkleBranchBuffers: Buffer[];
 
     public jobTemplateId: string;
     public networkDifficulty: number;
@@ -32,6 +36,7 @@ export class MiningJob {
 
         this.creation = new Date().getTime();
         this.jobTemplateId = jobTemplate.blockData.id;
+        this.merkleBranchBuffers = jobTemplate.merkle_branch.map(branch => Buffer.from(branch, 'hex'));
 
         this.coinbaseTransaction = this.createCoinbaseTransaction(payoutInformation, jobTemplate.blockData.coinbasevalue);
 
@@ -55,7 +60,7 @@ export class MiningJob {
         const blockHeightLengthByte = Buffer.from([blockHeightEncoded.length]);
 
         // Generate padding and take length of encode blockHeight into account
-        const padding = Buffer.alloc(8 + (3 - blockHeightEncoded.length), 0)
+        const padding = Buffer.alloc(TOTAL_EXTRANONCE_SIZE_BYTES + (3 - blockHeightEncoded.length), 0)
 
         // Build the script
         let script = Buffer.concat([blockHeightLengthByte, blockHeightEncoded, extra, padding]);
@@ -83,12 +88,43 @@ export class MiningJob {
 
         const partOneIndex = serializedCoinbaseTx.indexOf(inputScript) + inputScript.length;
 
-        this.coinbasePart1 = serializedCoinbaseTx.slice(0, partOneIndex - 16);
+        this.coinbasePart1 = serializedCoinbaseTx.slice(0, partOneIndex - (TOTAL_EXTRANONCE_SIZE_BYTES * 2));
         this.coinbasePart2 = serializedCoinbaseTx.slice(partOneIndex);
+        this.coinbasePart1Buffer = Buffer.from(this.coinbasePart1, 'hex');
+        this.coinbasePart2Buffer = Buffer.from(this.coinbasePart2, 'hex');
 
 
     }
 
+    public cloneCoinbaseTransaction(): bitcoinjs.Transaction {
+        return bitcoinjs.Transaction.fromBuffer(this.coinbaseTransaction.toBuffer());
+    }
+
+    public buildHeaderBuffer(jobTemplate: IJobTemplate, versionMask: number, nonce: number, extraNonce: string, extraNonce2: string, timestamp: number): Buffer {
+        const coinbaseBuffer = Buffer.concat([
+            this.coinbasePart1Buffer,
+            Buffer.from(`${extraNonce}${extraNonce2}`, 'hex'),
+            this.coinbasePart2Buffer,
+        ]);
+        const coinbaseHash = bitcoinjs.crypto.hash256(coinbaseBuffer);
+        const merkleRoot = this.calculateMerkleRootHash(coinbaseHash, this.merkleBranchBuffers);
+
+        let version = jobTemplate.block.version;
+        if (versionMask !== undefined && versionMask != 0) {
+            version = version ^ versionMask;
+        }
+
+        const header = Buffer.alloc(80);
+        header.writeInt32LE(version, 0);
+        jobTemplate.block.prevHash.copy(header, 4);
+        merkleRoot.copy(header, 36);
+        header.writeUInt32LE(timestamp, 68);
+        header.writeUInt32LE(jobTemplate.block.bits, 72);
+        header.writeUInt32LE(nonce, 76);
+
+        return header;
+    }
+
     public copyAndUpdateBlock(jobTemplate: IJobTemplate, versionMask: number, nonce: number, extraNonce: string, extraNonce2: string, timestamp: number): bitcoinjs.Block {
 
         const testBlock = Object.assign(new bitcoinjs.Block(), jobTemplate.block);
@@ -96,7 +132,7 @@ export class MiningJob {
             return Object.assign(new bitcoinjs.Transaction(), tx);
         });
 
-        testBlock.transactions[0] = this.coinbaseTransaction;
+        testBlock.transactions[0] = this.cloneCoinbaseTransaction();
 
         testBlock.nonce = nonce;
 
@@ -108,10 +144,10 @@ export class MiningJob {
         // set the nonces
         const nonceScript = testBlock.transactions[0].ins[0].script.toString('hex');
 
-        testBlock.transactions[0].ins[0].script = Buffer.from(`${nonceScript.substring(0, nonceScript.length - 16)}${extraNonce}${extraNonce2}`, 'hex');
+        testBlock.transactions[0].ins[0].script = Buffer.from(`${nonceScript.substring(0, nonceScript.length - (TOTAL_EXTRANONCE_SIZE_BYTES * 2))}${extraNonce}${extraNonce2}`, 'hex');
 
         //recompute the root since we updated the coinbase script with the nonces
-        testBlock.merkleRoot = this.calculateMerkleRootHash(testBlock.transactions[0].getHash(false), jobTemplate.merkle_branch);
+        testBlock.merkleRoot = this.calculateMerkleRootHash(testBlock.transactions[0].getHash(false), this.merkleBranchBuffers);
 
 
         testBlock.timestamp = timestamp;
@@ -120,14 +156,14 @@ export class MiningJob {
     }
 
 
-    private calculateMerkleRootHash(newRoot: Buffer, merkleBranches: string[]): Buffer {
+    private calculateMerkleRootHash(newRoot: Buffer, merkleBranches: Buffer[]): Buffer {
 
         const bothMerkles = Buffer.alloc(64);
 
         bothMerkles.set(newRoot);
 
         for (let i = 0; i < merkleBranches.length; i++) {
-            bothMerkles.set(Buffer.from(merkleBranches[i], 'hex'), 32);
+            bothMerkles.set(merkleBranches[i], 32);
             newRoot = bitcoinjs.crypto.hash256(bothMerkles);
             bothMerkles.set(newRoot);
         }

src/models/StratumV1Client.spec.ts

@@ -8,6 +8,7 @@ import { DataSource } from 'typeorm';
 import { MockRecording1 } from '../../test/models/MockRecording1';
 import { AddressSettingsModule } from '../ORM/address-settings/address-settings.module';
 import { AddressSettingsService } from '../ORM/address-settings/address-settings.service';
+import { BlocksEntity } from '../ORM/blocks/blocks.entity';
 import { BlocksService } from '../ORM/blocks/blocks.service';
 import { ClientStatisticsEntity } from '../ORM/client-statistics/client-statistics.entity';
 import { ClientStatisticsModule } from '../ORM/client-statistics/client-statistics.module';
@@ -18,8 +19,11 @@ import { ClientService } from '../ORM/client/client.service';
 import { BitcoinRpcService as MockBitcoinRpcService } from '../services/bitcoin-rpc.service';
 import { NotificationService } from '../services/notification.service';
 import { StratumV1JobsService } from '../services/stratum-v1-jobs.service';
+import { IBlockTemplate } from './bitcoin-rpc/IBlockTemplate';
 import { IMiningInfo } from './bitcoin-rpc/IMiningInfo';
+import { MiningJob } from './MiningJob';
 import { StratumV1Client } from './StratumV1Client';
+import { MiningSubmitMessage } from './stratum-messages/MiningSubmitMessage';
 
 
 
@@ -45,13 +49,20 @@ describe('StratumV1Client', () => {
     let clientStatisticsService: ClientStatisticsService;
     let notificationService: NotificationService;
     let blocksService: BlocksService;
+    let externalSharesService;
     let configService: ConfigService;
 
     let client: StratumV1Client;
 
     let socketEmitter: (...args: any[]) => void;
+    const emitMessage = (message: string) => socketEmitter(Buffer.from(`${message}\n`));
+    let consoleLogSpy: jest.SpyInstance;
+    let consoleErrorSpy: jest.SpyInstance;
+    let consoleWarnSpy: jest.SpyInstance;
 
-    let newBlockEmitter: BehaviorSubject<IMiningInfo> = new BehaviorSubject(null);
+    let newBlockEmitter: BehaviorSubject<IMiningInfo> = new BehaviorSubject({
+        blocks: MockRecording1.BLOCK_TEMPLATE.height
+    } as IMiningInfo);
 
     let moduleRef: TestingModule;
 
@@ -60,11 +71,12 @@ describe('StratumV1Client', () => {
             imports: [
                 TypeOrmModule.forRoot({
                     type: 'sqlite',
-                    database: './DB/public-pool.test.sqlite',
+                    database: ':memory:',
                     synchronize: true,
                     autoLoadEntities: true,
                     cache: true,
-                    logging: false
+                    logging: false,
+                    entities: [ClientEntity, ClientStatisticsEntity, BlocksEntity]
                 }),
                 ClientModule,
                 ClientStatisticsModule,
@@ -94,20 +106,36 @@ describe('StratumV1Client', () => {
 
     beforeEach(async () => {
 
-        console.log('NEW TEST')
+        jest.useFakeTimers({ advanceTimers: true })
+        jest.setSystemTime(new Date(parseInt(MockRecording1.TIME, 16) * 1000));
+        consoleLogSpy = jest.spyOn(console, 'log').mockImplementation(() => undefined);
+        consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => undefined);
+        consoleWarnSpy = jest.spyOn(console, 'warn').mockImplementation(() => undefined);
 
         clientService = moduleRef.get<ClientService>(ClientService);
+        clientService.insertQueue = [];
 
         const dataSource = moduleRef.get<DataSource>(DataSource);
 
-        dataSource.getRepository(ClientEntity).delete({});
-        dataSource.getRepository(ClientStatisticsEntity).delete({});
+        await dataSource.getRepository(ClientStatisticsEntity).clear();
+        await dataSource.getRepository(ClientEntity).clear();
+        await dataSource.getRepository(BlocksEntity).clear();
 
 
         clientStatisticsService = moduleRef.get<ClientStatisticsService>(ClientStatisticsService);
 
         configService = moduleRef.get<ConfigService>(ConfigService);
-
+        (configService.get as jest.Mock).mockImplementation((key: string) => {
+            switch (key) {
+                case 'DEV_FEE_ADDRESS':
+                    return 'tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4';
+                case 'NETWORK':
+                    return 'testnet';
+            }
+            return null;
+        });
+        (StratumV1Client as any).blockedUserAgentLogState.clear();
+        (StratumV1Client as any).validationErrorLogState.clear();
 
         bitcoinRpcService = new MockBitcoinRpcService(configService,null);
         jest.spyOn(bitcoinRpcService, 'getBlockTemplate').mockReturnValue(Promise.resolve(MockRecording1.BLOCK_TEMPLATE));
@@ -127,8 +155,18 @@ describe('StratumV1Client', () => {
         });
 
         socket.end = jest.fn();
+        jest.spyOn(socket, 'destroy').mockImplementation(() => socket);
 
         const addressSettings = moduleRef.get<AddressSettingsService>(AddressSettingsService);
+        notificationService = {
+            notifySubscribersBlockFound: jest.fn().mockResolvedValue(undefined)
+        } as any;
+        blocksService = {
+            save: jest.fn().mockResolvedValue(undefined)
+        } as any;
+        externalSharesService = {
+            submitShare: jest.fn().mockResolvedValue(undefined)
+        };
 
 
         client = new StratumV1Client(
@@ -140,16 +178,20 @@ describe('StratumV1Client', () => {
             notificationService,
             blocksService,
             configService,
-            addressSettings
+            addressSettings,
+            externalSharesService
         );
 
         client.extraNonceAndSessionId = MockRecording1.EXTRA_NONCE;
+        jest.spyOn(client as any, 'getRandomHexString').mockReturnValue(MockRecording1.EXTRA_NONCE);
 
-        jest.useFakeTimers({ advanceTimers: true })
     });
 
     afterEach(async () => {
         client.destroy();
+        consoleLogSpy.mockRestore();
+        consoleErrorSpy.mockRestore();
+        consoleWarnSpy.mockRestore();
         jest.useRealTimers();
     })
 
@@ -159,7 +201,7 @@ describe('StratumV1Client', () => {
     });
 
     it('should close socket on invalid JSON', () => {
-        socketEmitter(Buffer.from('INVALID'));
+        emitMessage('INVALID');
         jest.spyOn(socket, 'destroy');
         expect(socket.on).toHaveBeenCalled();
     });
@@ -168,21 +210,89 @@ describe('StratumV1Client', () => {
         jest.spyOn(socket, 'write').mockImplementation((data) => true);
 
         expect(socket.on).toHaveBeenCalled();
-        socketEmitter(Buffer.from(MockRecording1.MINING_SUBSCRIBE));
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
 
         await new Promise((r) => setTimeout(r, 1));
 
-        expect(socket.write).toHaveBeenCalledWith(`{"id":1,"error":null,"result":[[["mining.notify","${client.extraNonceAndSessionId}"]],"${client.extraNonceAndSessionId}",4]}\n`, expect.any(Function));
+        expect(socket.write).toHaveBeenCalledWith(`{"id":1,"error":null,"result":[[["mining.notify","${client.extraNonceAndSessionId}"]],"${client.extraNonceAndSessionId}",8]}\n`, expect.any(Function));
 
     });
 
+    it('should block non-compliant user agents on subscribe without allocating a session', async () => {
+        (configService.get as jest.Mock).mockImplementation((key: string) => {
+            switch (key) {
+                case 'NON_COMPLIANT_USER_AGENTS':
+                    return 'NMMiner';
+                case 'DEV_FEE_ADDRESS':
+                    return 'tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4';
+                case 'NETWORK':
+                    return 'testnet';
+            }
+            return null;
+        });
+        jest.spyOn(socket, 'write').mockImplementation((data) => true);
+
+        emitMessage(`{"id":1,"method":"mining.subscribe","params":["NMMiner/1.0"]}`);
+        await new Promise((r) => setTimeout(r, 1));
+
+        expect(socket.destroy).toHaveBeenCalled();
+        expect(socket.write).not.toHaveBeenCalled();
+        expect((client as any).statistics).toBeUndefined();
+        expect(consoleLogSpy).toHaveBeenCalledWith('Blocked non-compliant connection from userAgent: NMMiner');
+    });
+
+    it('should throttle repeated non-compliant user agent logs', async () => {
+        (configService.get as jest.Mock).mockImplementation((key: string) => {
+            switch (key) {
+                case 'NON_COMPLIANT_USER_AGENTS':
+                    return 'NMMiner';
+                case 'DEV_FEE_ADDRESS':
+                    return 'tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4';
+                case 'NETWORK':
+                    return 'testnet';
+            }
+            return null;
+        });
+        jest.spyOn(socket, 'write').mockImplementation((data) => true);
+
+        emitMessage(`{"id":1,"method":"mining.subscribe","params":["NMMiner/1.0"]}`);
+        await new Promise((r) => setTimeout(r, 1));
+
+        const secondSocket = new Socket();
+        jest.spyOn(secondSocket, 'on').mockImplementation((event: string, listener: (...args: any[]) => void) => {
+            socketEmitter = listener;
+            return secondSocket;
+        });
+        secondSocket.end = jest.fn();
+        jest.spyOn(secondSocket, 'destroy').mockImplementation(() => secondSocket);
+        const secondClient = new StratumV1Client(
+            secondSocket,
+            stratumV1JobsService,
+            bitcoinRpcService,
+            clientService,
+            clientStatisticsService,
+            notificationService,
+            blocksService,
+            configService,
+            moduleRef.get<AddressSettingsService>(AddressSettingsService),
+            externalSharesService
+        );
+
+        socketEmitter(Buffer.from(`{"id":1,"method":"mining.subscribe","params":["NMMiner/1.0"]}\n`));
+        await new Promise((r) => setTimeout(r, 1));
+
+        expect(secondSocket.destroy).toHaveBeenCalled();
+        expect(consoleLogSpy.mock.calls.filter(call => call[0]?.startsWith('Blocked non-compliant connection'))).toHaveLength(1);
+        await secondClient.destroy();
+    });
+
 
     it('should respond to mining.configure', async () => {
 
         jest.spyOn(socket, 'write').mockImplementation((data) => true);
 
         expect(socket.on).toHaveBeenCalled();
-        socketEmitter(Buffer.from(MockRecording1.MINING_CONFIGURE));
+        emitMessage(MockRecording1.MINING_CONFIGURE);
         await new Promise((r) => setTimeout(r, 1));
         expect(socket.write).toHaveBeenCalledWith(`{"id":2,"error":null,"result":{"version-rolling":true,"version-rolling.mask":"1fffe000"}}\n`, expect.any(Function));
     });
@@ -192,7 +302,7 @@ describe('StratumV1Client', () => {
         jest.spyOn(socket, 'write').mockImplementation((data) => true);
 
         expect(socket.on).toHaveBeenCalled();
-        socketEmitter(Buffer.from(MockRecording1.MINING_AUTHORIZE));
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
         await new Promise((r) => setTimeout(r, 1));
         expect(socket.write).toHaveBeenCalledWith('{"id":3,"error":null,"result":true}\n', expect.any(Function));
     });
@@ -201,7 +311,7 @@ describe('StratumV1Client', () => {
         jest.spyOn(socket, 'write').mockImplementation((data) => true);
 
         expect(socket.on).toHaveBeenCalled();
-        socketEmitter(Buffer.from(MockRecording1.MINING_SUGGEST_DIFFICULTY));
+        emitMessage(MockRecording1.MINING_SUGGEST_DIFFICULTY);
         await new Promise((r) => setTimeout(r, 1));
         expect(socket.write).toHaveBeenCalledWith(`{"id":null,"method":"mining.set_difficulty","params":[512]}\n`, expect.any(Function));
     });
@@ -209,20 +319,24 @@ describe('StratumV1Client', () => {
     it('should set difficulty', async () => {
         jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
 
-        console.log('should set difficulty')
-        socketEmitter(Buffer.from(MockRecording1.MINING_SUBSCRIBE));
-        socketEmitter(Buffer.from(MockRecording1.MINING_AUTHORIZE));
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
         await new Promise((r) => setTimeout(r, 100));
 
-        expect((client as any).write).toHaveBeenCalledWith(`{"id":null,"method":"mining.set_difficulty","params":[16384]}\n`);
+        expect((client as any).write).toHaveBeenCalledWith(`{"id":null,"method":"mining.set_difficulty","params":[100000]}\n`);
 
     });
 
     it('should save client', async () => {
         jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
 
-        socketEmitter(Buffer.from(MockRecording1.MINING_SUBSCRIBE));
-        socketEmitter(Buffer.from(MockRecording1.MINING_AUTHORIZE));
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(`{"id": 4, "method": "mining.suggest_difficulty", "params": [0]}`);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
+        await new Promise((r) => setTimeout(r, 100));
+        emitMessage(MockRecording1.MINING_SUBMIT);
+        await new Promise((r) => setTimeout(r, 100));
+        await clientService.insertClients();
         await new Promise((r) => setTimeout(r, 100));
 
         const clientCount = await clientService.connectedClientCount();
@@ -245,21 +359,27 @@ describe('StratumV1Client', () => {
         jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
 
 
-        socketEmitter(Buffer.from(MockRecording1.MINING_SUBSCRIBE));
-        socketEmitter(Buffer.from(MockRecording1.MINING_SUGGEST_DIFFICULTY));
-        socketEmitter(Buffer.from(MockRecording1.MINING_AUTHORIZE));
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(`{"id": 4, "method": "mining.suggest_difficulty", "params": [0]}`);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
 
 
 
         await new Promise((r) => setTimeout(r, 100));
 
+        const notifyCall = (client as any).write.mock.calls
+            .map(call => call[0])
+            .find((message: string) => message.includes('"method":"mining.notify"'));
+        const notify = JSON.parse(notifyCall);
+
+        expect(notify.params[0]).toBe('1');
+        expect(notify.params[5]).toBe('20000000');
+        expect(notify.params[6]).toBe('192495f8');
+        expect(notify.params[7]).toBe(MockRecording1.TIME);
+        expect(notify.params[8]).toBe(true);
 
 
-
-        expect((client as any).write).lastCalledWith(`{"id":null,"method":"mining.notify","params":["1","171592f223740e92d223f6e68bff25279af7ac4f2246451e0000000200000000","02000000010000000000000000000000000000000000000000000000000000000000000000ffffffff1903c943255c7075626c69632d706f6f6c5c","ffffffff037a90000000000000160014e6f22ca44dc800e9d049621a3b9a42c509f1c4bc3b0f250000000000160014e6f22ca44dc800e9d049621a3b9a42c509f1c4bc0000000000000000266a24aa21a9edbd3d1d916aa0b57326a2d88ebe1b68a1d7c48585f26d8335fe6a94b62755f64c00000000",["175335649d5e8746982969ec88f52e85ac9917106fba5468e699c8879ab974a1","d5644ab3e708c54cd68dc5aedc92b8d3037449687f92ec41ed6e37673d969d4a","5c9ec187517edc0698556cca5ce27e54c96acb014770599ed9df4d4937fbf2b0"],"20000000","192495f8","${MockRecording1.TIME}",false]}\n`);
-
-
-        socketEmitter(Buffer.from(MockRecording1.MINING_SUBMIT));
+        emitMessage(MockRecording1.MINING_SUBMIT);
 
         jest.useRealTimers();
         await new Promise((r) => setTimeout(r, 1000));
@@ -269,6 +389,243 @@ describe('StratumV1Client', () => {
 
     });
 
+    it('should use the header-only fast path for non-block submissions', async () => {
+        jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
+        const buildHeaderSpy = jest.spyOn(MiningJob.prototype, 'buildHeaderBuffer');
+        const fullBlockSpy = jest.spyOn(MiningJob.prototype, 'copyAndUpdateBlock');
+
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(`{"id": 4, "method": "mining.suggest_difficulty", "params": [0]}`);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
+        await new Promise((r) => setTimeout(r, 100));
+
+        emitMessage(MockRecording1.MINING_SUBMIT);
+        await new Promise((r) => setTimeout(r, 100));
+        await clientService.insertClients();
+        jest.useRealTimers();
+        await new Promise((r) => setTimeout(r, 1000));
+
+        expect(buildHeaderSpy).toHaveBeenCalled();
+        expect(fullBlockSpy).not.toHaveBeenCalled();
+    });
+
+    it('should write accepted response before share accounting finishes', async () => {
+        jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
+
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(`{"id": 4, "method": "mining.suggest_difficulty", "params": [0]}`);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
+        await new Promise((r) => setTimeout(r, 100));
+
+        let finishAccounting: () => void;
+        const accountingPromise = new Promise<void>((resolve) => {
+            finishAccounting = resolve;
+        });
+        jest.spyOn((client as any).statistics, 'addShares').mockReturnValue(accountingPromise);
+
+        emitMessage(MockRecording1.MINING_SUBMIT);
+        await Promise.resolve();
+        await Promise.resolve();
+        await Promise.resolve();
+
+        expect((client as any).write).toHaveBeenCalledWith(`{"id":5,"error":null,"result":true}\n`);
+
+        finishAccounting();
+        jest.useRealTimers();
+        await new Promise((r) => setTimeout(r, 100));
+    });
+
+    it('should update address best difficulty through the atomic path', async () => {
+        jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
+        jest.spyOn(client as any, 'calculateDifficulty').mockReturnValue({
+            submissionDifficulty: 1024,
+            submissionHash: 'share'
+        });
+        const addressSettings = moduleRef.get<AddressSettingsService>(AddressSettingsService);
+        const getSettingsSpy = jest.spyOn(addressSettings, 'getSettings');
+        const updateIfHigherSpy = jest.spyOn(addressSettings as any, 'updateBestDifficultyIfHigher').mockResolvedValue({ affected: 1 });
+        const clientUpdateIfHigherSpy = jest.spyOn(clientService as any, 'updateBestDifficultyIfHigher').mockResolvedValue({ affected: 1 });
+
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(`{"id": 4, "method": "mining.suggest_difficulty", "params": [0]}`);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
+        await new Promise((r) => setTimeout(r, 100));
+
+        emitMessage(MockRecording1.MINING_SUBMIT);
+        await new Promise((r) => setTimeout(r, 100));
+        await clientService.insertClients();
+        jest.useRealTimers();
+        await new Promise((r) => setTimeout(r, 1000));
+
+        expect(updateIfHigherSpy).toHaveBeenCalledWith(
+            'tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4',
+            1024,
+            expect.any(String)
+        );
+        expect(clientUpdateIfHigherSpy).toHaveBeenCalledWith(expect.any(String), 1024);
+        expect(getSettingsSpy).not.toHaveBeenCalled();
+    });
+
+    it('should reject duplicate submissions', async () => {
+        jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
+
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(`{"id": 4, "method": "mining.suggest_difficulty", "params": [0]}`);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
+        await new Promise((r) => setTimeout(r, 100));
+
+        emitMessage(MockRecording1.MINING_SUBMIT);
+        await new Promise((r) => setTimeout(r, 100));
+        emitMessage(MockRecording1.MINING_SUBMIT);
+        await new Promise((r) => setTimeout(r, 100));
+
+        expect((client as any).write).lastCalledWith(`{"id":5,"result":null,"error":[22,"Duplicate share",""]}\n`);
+    });
+
+    it('should reject submissions for unknown jobs', async () => {
+        jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
+        const hashSpy = jest.spyOn(MiningSubmitMessage.prototype, 'hash');
+
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(`{"id": 4, "method": "mining.suggest_difficulty", "params": [0]}`);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
+        await new Promise((r) => setTimeout(r, 100));
+
+        emitMessage(`{"id": 5, "method": "mining.submit", "params": ["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.bitaxe3", "ff", "c708000000000000", "64b3f3ec", "ed460d91", "00002000"]}`);
+        await new Promise((r) => setTimeout(r, 100));
+
+        expect((client as any).write).lastCalledWith(`{"id":5,"result":null,"error":[21,"Job not found",""]}\n`);
+        expect(await clientService.connectedClientCount()).toBe(0);
+        expect(hashSpy).not.toHaveBeenCalled();
+    });
+
+    it('should reject submissions when the job template has expired', async () => {
+        jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
+
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(`{"id": 4, "method": "mining.suggest_difficulty", "params": [0]}`);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
+        await new Promise((r) => setTimeout(r, 100));
+        stratumV1JobsService.blocks = {};
+
+        emitMessage(MockRecording1.MINING_SUBMIT);
+        await new Promise((r) => setTimeout(r, 100));
+
+        expect((client as any).write).lastCalledWith(`{"id":5,"result":null,"error":[21,"Job Template not found",""]}\n`);
+    });
+
+    it('should reject low difficulty shares', async () => {
+        jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
+
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(MockRecording1.MINING_SUGGEST_DIFFICULTY);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
+        await new Promise((r) => setTimeout(r, 100));
+
+        emitMessage(MockRecording1.MINING_SUBMIT);
+        await new Promise((r) => setTimeout(r, 100));
+
+        expect((client as any).write).lastCalledWith(`{"id":5,"result":null,"error":[23,"Difficulty too low",""]}\n`);
+        expect(await clientService.connectedClientCount()).toBe(0);
+    });
+
+    it('should reject submissions with short extranonce2 values', async () => {
+        jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
+
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
+        await new Promise((r) => setTimeout(r, 100));
+
+        emitMessage(`{"id": 5, "method": "mining.submit", "params": ["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.bitaxe3", "1", "c7080000", "64b3f3ec", "ed460d91", "00002000"]}`);
+        await new Promise((r) => setTimeout(r, 100));
+
+        expect((client as any).write).lastCalledWith(expect.stringContaining(`"error":[20,"Mining Submit validation error"`));
+        expect(socket.destroy).toHaveBeenCalled();
+        expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('Mining Submit validation error: extraNonce2:isLength'));
+    });
+
+    it('should throttle repeated mining submit validation logs', async () => {
+        jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
+
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
+        await new Promise((r) => setTimeout(r, 100));
+
+        emitMessage(`{"id": 5, "method": "mining.submit", "params": ["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.bitaxe3", "1", "c7080000", "64b3f3ec", "ed460d91", "00002000"]}`);
+        await new Promise((r) => setTimeout(r, 100));
+
+        const secondSocket = new Socket();
+        jest.spyOn(secondSocket, 'on').mockImplementation((event: string, listener: (...args: any[]) => void) => {
+            socketEmitter = listener;
+            return secondSocket;
+        });
+        secondSocket.end = jest.fn();
+        jest.spyOn(secondSocket, 'destroy').mockImplementation(() => secondSocket);
+        const secondClient = new StratumV1Client(
+            secondSocket,
+            stratumV1JobsService,
+            bitcoinRpcService,
+            clientService,
+            clientStatisticsService,
+            notificationService,
+            blocksService,
+            configService,
+            moduleRef.get<AddressSettingsService>(AddressSettingsService),
+            externalSharesService
+        );
+        jest.spyOn(secondClient as any, 'write').mockImplementation((data) => Promise.resolve(true));
+        jest.spyOn(secondClient as any, 'getRandomHexString').mockReturnValue(MockRecording1.EXTRA_NONCE);
+
+        socketEmitter(Buffer.from(`${MockRecording1.MINING_SUBSCRIBE}\n`));
+        socketEmitter(Buffer.from(`${MockRecording1.MINING_AUTHORIZE}\n`));
+        await new Promise((r) => setTimeout(r, 100));
+        socketEmitter(Buffer.from(`{"id": 5, "method": "mining.submit", "params": ["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.bitaxe3", "1", "c7080000", "64b3f3ec", "ed460d91", "00002000"]}\n`));
+        await new Promise((r) => setTimeout(r, 100));
+
+        expect(consoleWarnSpy.mock.calls.filter(call => call[0]?.startsWith('Mining Submit validation error'))).toHaveLength(1);
+        await secondClient.destroy();
+    });
+
+    it('should close socket when a submit arrives before stratum is initialized', async () => {
+        const endSpy = jest.spyOn(socket, 'end');
+
+        emitMessage(MockRecording1.MINING_SUBMIT);
+        await new Promise((r) => setTimeout(r, 100));
+
+        expect(endSpy).toHaveBeenCalled();
+    });
+
+    it('should submit and persist found blocks', async () => {
+        jest.spyOn(client as any, 'write').mockImplementation((data) => Promise.resolve(true));
+        jest.spyOn(client as any, 'calculateDifficulty').mockReturnValue({
+            submissionDifficulty: Number.MAX_SAFE_INTEGER,
+            submissionHash: 'block-share'
+        });
+        const addressSettings = moduleRef.get<AddressSettingsService>(AddressSettingsService);
+        jest.spyOn(addressSettings, 'resetBestDifficultyAndShares').mockResolvedValue(undefined);
+
+        emitMessage(MockRecording1.MINING_SUBSCRIBE);
+        emitMessage(`{"id": 4, "method": "mining.suggest_difficulty", "params": [0]}`);
+        emitMessage(MockRecording1.MINING_AUTHORIZE);
+        await new Promise((r) => setTimeout(r, 100));
+
+        emitMessage(MockRecording1.MINING_SUBMIT);
+        jest.useRealTimers();
+        await new Promise((r) => setTimeout(r, 1000));
+
+        expect(bitcoinRpcService.SUBMIT_BLOCK).toHaveBeenCalledWith(expect.any(String));
+        expect(blocksService.save).toHaveBeenCalledWith(expect.objectContaining({
+            height: MockRecording1.BLOCK_TEMPLATE.height,
+            minerAddress: 'tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4',
+            worker: 'bitaxe3',
+            sessionId: MockRecording1.EXTRA_NONCE,
+            blockData: expect.any(String)
+        }));
+        expect(notificationService.notifySubscribersBlockFound).toHaveBeenCalled();
+        expect(addressSettings.resetBestDifficultyAndShares).toHaveBeenCalled();
+        expect((client as any).write).lastCalledWith(`{"id":5,"error":null,"result":true}\n`);
+    });
+
 
 
 });

src/models/StratumV1Client.ts

@@ -1,7 +1,7 @@
 import { ConfigService } from '@nestjs/config';
 import * as bitcoinjs from 'bitcoinjs-lib';
 import { plainToInstance } from 'class-transformer';
-import { validate, ValidatorOptions } from 'class-validator';
+import { validate, ValidationError, ValidatorOptions } from 'class-validator';
 import * as crypto from 'crypto';
 import { Socket } from 'net';
 import { firstValueFrom, Subscription } from 'rxjs';
@@ -24,25 +24,30 @@ import { ConfigurationMessage } from './stratum-messages/ConfigurationMessage';
 import { MiningSubmitMessage } from './stratum-messages/MiningSubmitMessage';
 import { StratumErrorMessage } from './stratum-messages/StratumErrorMessage';
 import { SubscriptionMessage } from './stratum-messages/SubscriptionMessage';
+import { EXTRANONCE1_SIZE_BYTES } from './stratum.constants';
 import { SuggestDifficulty } from './stratum-messages/SuggestDifficultyMessage';
 import { StratumV1ClientStatistics } from './StratumV1ClientStatistics';
 import { ExternalSharesService } from '../services/external-shares.service';
-import { DifficultyUtils } from '../utils/difficulty.utils';
 
+const TRUE_DIFF_ONE = 2.695953529101131e67;
+const BLOCKED_USER_AGENT_LOG_INTERVAL_MS = 60 * 1000;
+const VALIDATION_ERROR_LOG_INTERVAL_MS = 60 * 1000;
 
 export class StratumV1Client {
+    private static blockedUserAgentLogState = new Map<string, { nextLogAt: number, suppressed: number }>();
+    private static validationErrorLogState = new Map<string, { nextLogAt: number, suppressed: number, sample: string }>();
 
     private clientSubscription: SubscriptionMessage;
     private clientConfiguration: ConfigurationMessage;
     private clientAuthorization: AuthorizationMessage;
     private clientSuggestedDifficulty: SuggestDifficulty;
     private stratumSubscription: Subscription;
-    private backgroundWork: NodeJS.Timer[] = [];
+    private backgroundWork: NodeJS.Timeout[] = [];
 
     private statistics: StratumV1ClientStatistics;
     private stratumInitialized = false;
     private usedSuggestedDifficulty = false;
-    private sessionDifficulty: number = 16384;
+    private sessionDifficulty: number = 100000;
 
     private entity: ClientEntity;
     private creatingEntity: Promise<void>;
@@ -53,6 +58,8 @@ export class StratumV1Client {
     public hashRate: number = 0;
 
     private buffer: string = '';
+    private connectionClosed = false;
+    private lastSentMiningJobTimestamp: number = null;
 
     private miningSubmissionHashes = new Set<string>()
 
@@ -74,16 +81,19 @@ export class StratumV1Client {
             let lines = this.buffer.split('\n');
             this.buffer = lines.pop() || ''; // Save the last part of the data (incomplete line) to the buffer
 
-            lines
-                .filter(m => m.length > 0)
-                .forEach(async (m) => {
+            (async () => {
+                for (const m of lines.filter(l => l.length > 0)) {
+                    if (this.connectionClosed || this.socket.destroyed || this.socket.writableEnded) {
+                        break;
+                    }
                     try {
                         await this.handleMessage(m);
                     } catch (e) {
                         await this.socket.end();
                         console.error(e);
                     }
-                });
+                }
+            })();
         });
 
 
@@ -105,10 +115,8 @@ export class StratumV1Client {
     }
 
     private getRandomHexString() {
-        const randomBytes = crypto.randomBytes(4); // 4 bytes = 32 bits
-        const randomNumber = randomBytes.readUInt32BE(0); // Convert bytes to a 32-bit unsigned integer
-        const hexString = randomNumber.toString(16).padStart(8, '0'); // Convert to hex and pad with zeros
-        return hexString;
+        const randomBytes = crypto.randomBytes(EXTRANONCE1_SIZE_BYTES);
+        return randomBytes.toString('hex');
     }
 
 
@@ -142,6 +150,11 @@ export class StratumV1Client {
                 const errors = await validate(subscriptionMessage, validatorOptions);
 
                 if (errors.length === 0) {
+                    if (this.isBlockedUserAgent(subscriptionMessage.userAgent)) {
+                        this.logBlockedUserAgent(subscriptionMessage.userAgent);
+                        this.closeSocket();
+                        return;
+                    }
 
                     if (this.sessionStart == null) {
                         this.sessionStart = new Date();
@@ -225,6 +238,9 @@ export class StratumV1Client {
 
                 if (errors.length === 0) {
                     this.clientAuthorization = authorizationMessage;
+                    if (this.clientSuggestedDifficulty == null && this.clientAuthorization.startingDiff != null && this.clientAuthorization.startingDiff > this.sessionDifficulty) {
+                        this.sessionDifficulty = this.clientAuthorization.startingDiff;
+                    }
                     const success = await this.write(JSON.stringify(this.clientAuthorization.response()) + '\n');
                     if (!success) {
                         return;
@@ -318,17 +334,18 @@ export class StratumV1Client {
 
 
                 } else {
-                    console.log('Mining Submit validation error');
+                    this.logValidationError('Mining Submit validation error', errors);
                     const err = new StratumErrorMessage(
                         miningSubmitMessage.id,
                         eStratumErrorCode.OtherUnknown,
                         'Mining Submit validation error',
                         errors).response();
-                    console.error(err);
                     const success = await this.write(err);
                     if (!success) {
                         return;
                     }
+                    this.closeSocket();
+                    return;
                 }
                 break;
             }
@@ -353,6 +370,12 @@ export class StratumV1Client {
     private async initStratum() {
         this.stratumInitialized = true;
 
+        if (this.isBlockedUserAgent(this.clientSubscription.userAgent)) {
+            this.logBlockedUserAgent(this.clientSubscription.userAgent);
+            this.closeSocket();
+            return;
+        }
+
         switch (this.clientSubscription.userAgent) {
             case 'cpuminer': {
                 this.sessionDifficulty = 0.1;
@@ -438,6 +461,7 @@ export class StratumV1Client {
         if (!success) {
             return;
         }
+        this.lastSentMiningJobTimestamp = jobTemplate.block.timestamp;
 
 
         //console.log(`Sent new job to ${this.clientAuthorization.worker}.${this.extraNonceAndSessionId}. (clearJobs: ${jobTemplate.blockData.clearJobs}, fee?: ${!this.noFee})`)
@@ -445,46 +469,28 @@ export class StratumV1Client {
     }
 
 
-    private async handleMiningSubmission(submission: MiningSubmitMessage) {
+    private async ensureClientEntity() {
+        if (this.entity != null) {
+            return;
+        }
 
-        if (this.entity == null) {
-            if (this.creatingEntity == null) {
-                this.creatingEntity = new Promise(async (resolve, reject) => {
-                    try {
-                        this.entity = await this.clientService.insert({
-                            sessionId: this.extraNonceAndSessionId,
-                            address: this.clientAuthorization.address,
-                            clientName: this.clientAuthorization.worker,
-                            userAgent: this.clientSubscription.userAgent,
-                            startTime: new Date(),
-                            bestDifficulty: 0
-                        });
-                    } catch (e) {
-                        reject(e);
-                    }
-                    resolve();
+        if (this.creatingEntity == null) {
+            this.creatingEntity = (async () => {
+                this.entity = await this.clientService.insert({
+                    sessionId: this.extraNonceAndSessionId,
+                    address: this.clientAuthorization.address,
+                    clientName: this.clientAuthorization.worker,
+                    userAgent: this.clientSubscription.userAgent,
+                    startTime: new Date(),
+                    bestDifficulty: 0
                 });
-                await this.creatingEntity;
-
-            } else {
-                await this.creatingEntity;
-            }
+            })();
         }
 
-        const submissionHash = submission.hash();
-        if(this.miningSubmissionHashes.has(submissionHash)){
-            const err = new StratumErrorMessage(
-                submission.id,
-                eStratumErrorCode.DuplicateShare,
-                'Duplicate share').response();
-            const success = await this.write(err);
-            if (!success) {
-                return false;
-            }
-            return false;
-        }else{
-            this.miningSubmissionHashes.add(submissionHash);
-        }
+        await this.creatingEntity;
+    }
+
+    private async handleMiningSubmission(submission: MiningSubmitMessage) {
 
         const job = this.stratumV1JobsService.getJobById(submission.jobId);
 
@@ -503,24 +509,73 @@ export class StratumV1Client {
         }
         const jobTemplate = this.stratumV1JobsService.getJobTemplateById(job.jobTemplateId);
 
-        const updatedJobBlock = job.copyAndUpdateBlock(
+        if (jobTemplate == null) {
+            const err = new StratumErrorMessage(
+                submission.id,
+                eStratumErrorCode.JobNotFound,
+                'Job Template not found').response();
+            //console.log(err);
+            const success = await this.write(err);
+            if (!success) {
+                return false;
+            }
+            return false;
+        }
+
+        const submissionHash = [
+            submission.jobId,
+            submission.extraNonce2,
+            submission.ntime,
+            submission.nonce,
+            submission.versionMask ?? ''
+        ].join(':');
+        if (this.miningSubmissionHashes.has(submissionHash)) {
+            const err = new StratumErrorMessage(
+                submission.id,
+                eStratumErrorCode.DuplicateShare,
+                'Duplicate share').response();
+            const success = await this.write(err);
+            if (!success) {
+                return false;
+            }
+            return false;
+        } else {
+            this.miningSubmissionHashes.add(submissionHash);
+        }
+
+        const versionMask = parseInt(submission.versionMask, 16);
+        const nonce = parseInt(submission.nonce, 16);
+        const timestamp = parseInt(submission.ntime, 16);
+
+        const header = job.buildHeaderBuffer(
             jobTemplate,
-            parseInt(submission.versionMask, 16),
-            parseInt(submission.nonce, 16),
+            versionMask,
+            nonce,
             this.extraNonceAndSessionId,
             submission.extraNonce2,
-            parseInt(submission.ntime, 16)
+            timestamp
         );
-        const header = updatedJobBlock.toBuffer(true);
-        const { submissionDifficulty } = DifficultyUtils.calculateDifficulty(header);
+        const { submissionDifficulty } = this.calculateDifficulty(header);
 
         //console.log(`DIFF: ${submissionDifficulty} of ${this.sessionDifficulty} from ${this.clientAuthorization.worker + '.' + this.extraNonceAndSessionId}`);
 
 
         if (submissionDifficulty >= this.sessionDifficulty) {
+            const success = await this.write(JSON.stringify(submission.response()) + '\n');
+            if (!success) {
+                return false;
+            }
 
             if (submissionDifficulty >= jobTemplate.blockData.networkDifficulty) {
                 console.log('!!! BLOCK FOUND !!!');
+                const updatedJobBlock = job.copyAndUpdateBlock(
+                    jobTemplate,
+                    versionMask,
+                    nonce,
+                    this.extraNonceAndSessionId,
+                    submission.extraNonce2,
+                    timestamp
+                );
                 const blockHex = updatedJobBlock.toHex(false);
                 const result = await this.bitcoinRpcService.SUBMIT_BLOCK(blockHex);
                 await this.blocksService.save({
@@ -537,6 +592,7 @@ export class StratumV1Client {
                     await this.addressSettingsService.resetBestDifficultyAndShares();
                 }
             }
+            await this.ensureClientEntity();
             try {
                 await this.statistics.addShares(this.entity, this.sessionDifficulty);
                 const now = new Date();
@@ -551,11 +607,9 @@ export class StratumV1Client {
             }
 
             if (submissionDifficulty > this.entity.bestDifficulty) {
-                await this.clientService.updateBestDifficulty(this.extraNonceAndSessionId, submissionDifficulty);
+                await this.clientService.updateBestDifficultyIfHigher(this.extraNonceAndSessionId, submissionDifficulty);
                 this.entity.bestDifficulty = submissionDifficulty;
-                if (submissionDifficulty > (await this.addressSettingsService.getSettings(this.clientAuthorization.address, true)).bestDifficulty) {
-                    await this.addressSettingsService.updateBestDifficulty(this.clientAuthorization.address, submissionDifficulty, this.entity.userAgent);
-                }
+                await this.addressSettingsService.updateBestDifficultyIfHigher(this.clientAuthorization.address, submissionDifficulty, this.entity.userAgent);
             }
 
 
@@ -587,7 +641,7 @@ export class StratumV1Client {
         }
 
         //await this.checkDifficulty();
-        return true;
+        return false;
 
     }
 
@@ -611,13 +665,130 @@ export class StratumV1Client {
             await this.socket.write(data);
 
             const jobTemplate = await firstValueFrom(this.stratumV1JobsService.newMiningJob$);
-            // we need to clear the jobs so that the difficulty set takes effect. Otherwise the different miner implementations can cause issues
-            jobTemplate.blockData.clearJobs = true;
-            await this.sendNewMiningJob(jobTemplate);
+            const nextTimestamp = Math.max(
+                jobTemplate.block.timestamp,
+                Math.floor(Date.now() / 1000),
+                (this.lastSentMiningJobTimestamp ?? 0) + 1
+            );
+            // We need to clear jobs so the difficulty takes effect, but avoid mutating or
+            // re-sending the shared cached template with byte-identical work.
+            const refreshedJobTemplate: IJobTemplate = {
+                ...jobTemplate,
+                block: Object.assign(new bitcoinjs.Block(), jobTemplate.block, {
+                    timestamp: nextTimestamp
+                }),
+                blockData: { ...jobTemplate.blockData, clearJobs: true }
+            };
+            await this.sendNewMiningJob(refreshedJobTemplate);
 
         }
     }
 
+    private calculateDifficulty(header: Buffer): { submissionDifficulty: number, submissionHash: string } {
+
+        const hashResult = bitcoinjs.crypto.hash256(header);
+
+        const target = this.le256todouble(hashResult);
+        const submissionDifficulty = target === 0 ? Number.POSITIVE_INFINITY : TRUE_DIFF_ONE / target;
+        return { submissionDifficulty, submissionHash: hashResult.toString('hex') };
+    }
+
+
+    private le256todouble(target: Buffer): number {
+
+        let number = 0;
+        for (let i = target.length - 1; i >= 0; i--) {
+            number = number * 256 + target[i];
+        }
+
+        return number;
+    }
+
+    private isBlockedUserAgent(userAgent: string): boolean {
+        const blockedUserAgents = this.configService.get<string>('NON_COMPLIANT_USER_AGENTS')
+            || this.configService.get<string>('BLOCKED_USER_AGENTS')
+            || this.configService.get<string>('COMPLIANT_HEADERS');
+        if (!blockedUserAgents || blockedUserAgents.trim() === '') {
+            return false;
+        }
+
+        const blockedList = blockedUserAgents.split(',').map(ua => ua.trim().toLowerCase());
+        const userAgentLower = userAgent.toLowerCase();
+
+        return blockedList.some(blocked => blocked.length > 0 && userAgentLower.includes(blocked));
+    }
+
+    private logBlockedUserAgent(userAgent: string) {
+        const now = Date.now();
+        const logState = StratumV1Client.blockedUserAgentLogState.get(userAgent);
+
+        if (logState != null && now < logState.nextLogAt) {
+            logState.suppressed += 1;
+            return;
+        }
+
+        const suppressed = logState?.suppressed ?? 0;
+        const suffix = suppressed > 0 ? ` (${suppressed} similar connections suppressed)` : '';
+        console.log(`Blocked non-compliant connection from userAgent: ${userAgent}${suffix}`);
+        StratumV1Client.blockedUserAgentLogState.set(userAgent, {
+            nextLogAt: now + BLOCKED_USER_AGENT_LOG_INTERVAL_MS,
+            suppressed: 0
+        });
+    }
+
+    private logValidationError(label: string, errors: ValidationError[]) {
+        const now = Date.now();
+        const signature = this.getValidationErrorSignature(errors);
+        const sample = this.getValidationErrorSample(errors);
+        const key = `${label}:${signature}`;
+        const logState = StratumV1Client.validationErrorLogState.get(key);
+
+        if (logState != null && now < logState.nextLogAt) {
+            logState.suppressed += 1;
+            return;
+        }
+
+        const suppressed = logState?.suppressed ?? 0;
+        const suffix = suppressed > 0 ? ` (${suppressed} similar validation errors suppressed)` : '';
+        console.warn(`${label}: ${signature}${sample}${suffix}`);
+        StratumV1Client.validationErrorLogState.set(key, {
+            nextLogAt: now + VALIDATION_ERROR_LOG_INTERVAL_MS,
+            suppressed: 0,
+            sample
+        });
+    }
+
+    private getValidationErrorSignature(errors: ValidationError[]): string {
+        if (errors.length === 0) {
+            return 'unknown';
+        }
+
+        return errors.map(error => {
+            const constraints = Object.keys(error.constraints ?? {}).sort().join('|') || 'invalid';
+            return `${error.property}:${constraints}`;
+        }).join(';');
+    }
+
+    private getValidationErrorSample(errors: ValidationError[]): string {
+        const values = errors
+            .map(error => error.value)
+            .filter(value => value != null)
+            .map(value => String(value).replace(/[\r\n]/g, '').slice(0, 64));
+
+        if (values.length === 0) {
+            return '';
+        }
+
+        return ` sample=${values.join(',')}`;
+    }
+
+    private closeSocket() {
+        this.connectionClosed = true;
+        if (!this.socket.destroyed) {
+            this.socket.destroy();
+        }
+    }
+
     private async write(message: string): Promise<boolean> {
         try {
             if (!this.socket.destroyed && !this.socket.writableEnded) {

src/models/StratumV1ClientStatistics.spec.ts

@@ -0,0 +1,110 @@
+import { StratumV1ClientStatistics } from './StratumV1ClientStatistics';
+
+describe('StratumV1ClientStatistics', () => {
+    const client = {
+        id: 'client-id',
+        address: 'tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4',
+        clientName: 'bitaxe3',
+        sessionId: '57a6f098'
+    } as any;
+
+    let clientStatisticsService: {
+        insert: jest.Mock,
+        update: jest.Mock
+    };
+    let statistics: StratumV1ClientStatistics;
+
+    beforeEach(() => {
+        jest.useFakeTimers();
+        jest.setSystemTime(new Date('2026-05-06T12:00:00Z'));
+        clientStatisticsService = {
+            insert: jest.fn().mockResolvedValue(undefined),
+            update: jest.fn().mockResolvedValue(undefined)
+        };
+        statistics = new StratumV1ClientStatistics(clientStatisticsService as any);
+    });
+
+    afterEach(() => {
+        jest.useRealTimers();
+    });
+
+    it('should insert the first share bucket', async () => {
+        await statistics.addShares(client, 64);
+
+        expect(clientStatisticsService.insert).toHaveBeenCalledWith({
+            time: new Date('2026-05-06T12:00:00Z').getTime(),
+            shares: 64,
+            acceptedCount: 1,
+            address: client.address,
+            clientName: client.clientName,
+            sessionId: client.sessionId
+        });
+    });
+
+    it('should update the current share bucket for additional shares', async () => {
+        await statistics.addShares(client, 64);
+        jest.setSystemTime(new Date('2026-05-06T12:01:01Z'));
+        await statistics.addShares(client, 32);
+
+        expect(clientStatisticsService.update).toHaveBeenCalledWith({
+            time: new Date('2026-05-06T12:00:00Z').getTime(),
+            shares: 96,
+            acceptedCount: 2,
+            address: client.address,
+            clientName: client.clientName,
+            sessionId: client.sessionId
+        });
+    });
+
+    it('should create a new share bucket when the time slot changes', async () => {
+        await statistics.addShares(client, 64);
+        jest.setSystemTime(new Date('2026-05-06T12:10:00Z'));
+
+        await statistics.addShares(client, 32);
+
+        expect(clientStatisticsService.update).toHaveBeenCalledWith({
+            time: new Date('2026-05-06T12:00:00Z').getTime(),
+            shares: 64,
+            acceptedCount: 1,
+            address: client.address,
+            clientName: client.clientName,
+            sessionId: client.sessionId
+        });
+        expect(clientStatisticsService.insert).toHaveBeenLastCalledWith({
+            time: new Date('2026-05-06T12:10:00Z').getTime(),
+            shares: 32,
+            acceptedCount: 1,
+            address: client.address,
+            clientName: client.clientName,
+            sessionId: client.sessionId
+        });
+    });
+
+    it('should not suggest a difficulty change before enough time or shares have passed', () => {
+        expect(statistics.getSuggestedDifficulty(64)).toBeNull();
+    });
+
+    it('should lower difficulty when a miner has not submitted shares for several minutes', () => {
+        jest.setSystemTime(new Date('2026-05-06T12:06:00Z'));
+
+        expect(statistics.getSuggestedDifficulty(64)).toBe(8);
+    });
+
+    it('should increase difficulty for rapid submissions', async () => {
+        for (let i = 0; i < 5; i++) {
+            jest.setSystemTime(new Date(Date.parse('2026-05-06T12:00:00Z') + (i * 1000)));
+            await statistics.addShares(client, 64);
+        }
+
+        expect(statistics.getSuggestedDifficulty(64)).toBe(512);
+    });
+
+    it('should decrease difficulty for slow submissions', async () => {
+        for (let i = 0; i < 5; i++) {
+            jest.setSystemTime(new Date(Date.parse('2026-05-06T12:00:00Z') + (i * 150000)));
+            await statistics.addShares(client, 64);
+        }
+
+        expect(statistics.getSuggestedDifficulty(128)).toBe(4);
+    });
+});

src/models/stratum-messages/AuthorizationMessage.spec.ts

@@ -0,0 +1,49 @@
+import { plainToInstance } from 'class-transformer';
+
+import { AuthorizationMessage } from './AuthorizationMessage';
+
+describe('AuthorizationMessage', () => {
+    it('should parse address, worker, and starting difficulty', () => {
+        const message = plainToInstance(
+            AuthorizationMessage,
+            JSON.parse('{"id":3,"method":"mining.authorize","params":["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.worker1","x,d=2048"]}')
+        );
+
+        expect(message.address).toBe('tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4');
+        expect(message.worker).toBe('worker1');
+        expect(message.password).toBe('x,d=2048');
+        expect(message.startingDiff).toBe(2048);
+    });
+
+    it('should default worker name when one is not provided', () => {
+        const message = plainToInstance(
+            AuthorizationMessage,
+            JSON.parse('{"id":3,"method":"mining.authorize","params":["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4","x"]}')
+        );
+
+        expect(message.worker).toBe('worker');
+        expect(message.startingDiff).toBeNull();
+    });
+
+    it('should ignore malformed starting difficulty hints', () => {
+        const message = plainToInstance(
+            AuthorizationMessage,
+            JSON.parse('{"id":3,"method":"mining.authorize","params":["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.worker1","x,d=abc"]}')
+        );
+
+        expect(message.startingDiff).toBeNull();
+    });
+
+    it('should build successful authorization responses', () => {
+        const message = plainToInstance(
+            AuthorizationMessage,
+            JSON.parse('{"id":3,"method":"mining.authorize","params":["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.worker1","x"]}')
+        );
+
+        expect(message.response()).toEqual({
+            id: 3,
+            error: null,
+            result: true
+        });
+    });
+});

src/models/stratum-messages/AuthorizationMessage.ts

@@ -1,5 +1,5 @@
 import { Expose, Transform } from 'class-transformer';
-import { ArrayMaxSize, ArrayMinSize, IsArray, IsOptional, IsString, MaxLength } from 'class-validator';
+import { ArrayMaxSize, ArrayMinSize, IsArray, IsNumber, IsOptional, IsString, MaxLength } from 'class-validator';
 
 import { eRequestMethod } from '../enums/eRequestMethod';
 import { IsBitcoinAddress } from '../validators/bitcoin-address.validator';
@@ -8,7 +8,7 @@ import { StratumBaseMessage } from './StratumBaseMessage';
 export class AuthorizationMessage extends StratumBaseMessage {
 
     @IsArray()
-    @ArrayMinSize(2)
+    @ArrayMinSize(1)
     @ArrayMaxSize(2)
     params: string[];
 
@@ -28,6 +28,19 @@ export class AuthorizationMessage extends StratumBaseMessage {
     })
     public worker: string;
 
+    @Expose()
+    @IsNumber()
+    @Transform(({ value, key, obj, type }) => {
+        const password: string | null = obj.params[1];
+        const difficultyMatch = password?.match(/(?:^|,)d=(\d+)(?:,|$)/);
+        if (difficultyMatch != null) {
+            const startingDiff = Number.parseInt(difficultyMatch[1], 10);
+            return Number.isFinite(startingDiff) ? startingDiff : null;
+        }
+        return null;
+    })
+    @IsOptional()
+    public startingDiff?: number;
 
     @Expose()
     @IsString()

src/models/stratum-messages/MiningSubmitMessage.spec.ts

@@ -1,4 +1,5 @@
 import { plainToInstance } from 'class-transformer';
+import { validate } from 'class-validator';
 
 import { MiningSubmitMessage } from './MiningSubmitMessage';
 
@@ -13,7 +14,7 @@ describe('MiningSubmitMessage', () => {
 
     describe('test message parsing', () => {
 
-        const MINING_SUBMIT_MESSAGE = ' {"id": 5, "method": "mining.submit", "params": ["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.bitaxe3", "1", "99020000", "64b1f10f", "2402812d", "00006000"]}'
+        const MINING_SUBMIT_MESSAGE = ' {"id": 5, "method": "mining.submit", "params": ["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.bitaxe3", "1", "9902000000000000", "64b1f10f", "2402812d", "00006000"]}'
 
         const message = plainToInstance(
             MiningSubmitMessage,
@@ -24,11 +25,39 @@ describe('MiningSubmitMessage', () => {
             expect(message.id).toEqual(5);
             expect(message.userId).toEqual('tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.bitaxe3');
             expect(message.jobId).toEqual('1');
-            expect(message.extraNonce2).toEqual('99020000');
+            expect(message.extraNonce2).toEqual('9902000000000000');
             expect(message.ntime).toEqual('64b1f10f');
             expect(message.nonce).toEqual('2402812d');
             expect(message.versionMask).toEqual('00006000');
         });
+
+        it('should validate 8-byte extranonce2 submissions', async () => {
+            const errors = await validate(message);
+
+            expect(errors).toEqual([]);
+        });
+
+        it('should reject short extranonce2 submissions', async () => {
+            const shortMessage = plainToInstance(
+                MiningSubmitMessage,
+                JSON.parse(' {"id": 5, "method": "mining.submit", "params": ["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.bitaxe3", "1", "99020000", "64b1f10f", "2402812d", "00006000"]}'),
+            );
+
+            const errors = await validate(shortMessage);
+
+            expect(errors.some(error => error.property === 'extraNonce2')).toBe(true);
+        });
+
+        it('should reject long extranonce2 submissions', async () => {
+            const longMessage = plainToInstance(
+                MiningSubmitMessage,
+                JSON.parse(' {"id": 5, "method": "mining.submit", "params": ["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.bitaxe3", "1", "990200000000000000", "64b1f10f", "2402812d", "00006000"]}'),
+            );
+
+            const errors = await validate(longMessage);
+
+            expect(errors.some(error => error.property === 'extraNonce2')).toBe(true);
+        });
     });
 
 

src/models/stratum-messages/MiningSubmitMessage.ts

@@ -1,7 +1,8 @@
 import { Expose, Transform } from 'class-transformer';
-import { ArrayMaxSize, ArrayMinSize, IsArray, IsString } from 'class-validator';
+import { ArrayMaxSize, ArrayMinSize, IsArray, IsString, Length } from 'class-validator';
 
 import { eRequestMethod } from '../enums/eRequestMethod';
+import { EXTRANONCE2_SIZE_BYTES } from '../stratum.constants';
 import { StratumBaseMessage } from './StratumBaseMessage';
 import * as bitcoinjs from 'bitcoinjs-lib';
 
@@ -27,6 +28,7 @@ export class MiningSubmitMessage extends StratumBaseMessage {
     public jobId: string;
     @Expose()
     @IsString()
+    @Length(EXTRANONCE2_SIZE_BYTES * 2, EXTRANONCE2_SIZE_BYTES * 2)
     @Transform(({ value, key, obj, type }) => {
         return obj.params[2];
     })

src/models/stratum-messages/SubscriptionMessage.spec.ts

@@ -0,0 +1,45 @@
+import { plainToInstance } from 'class-transformer';
+
+import { SubscriptionMessage } from './SubscriptionMessage';
+
+describe('SubscriptionMessage', () => {
+    it('should parse and refine known user agents', () => {
+        const bosminer = plainToInstance(
+            SubscriptionMessage,
+            JSON.parse('{"id":1,"method":"mining.subscribe","params":["bosminer/23.08"]}')
+        );
+        const cpuminer = plainToInstance(
+            SubscriptionMessage,
+            JSON.parse('{"id":1,"method":"mining.subscribe","params":["cpuminer-opt/1.0"]}')
+        );
+
+        expect(bosminer.userAgent).toBe('Braiins OS');
+        expect(cpuminer.userAgent).toBe('cpuminer');
+    });
+
+    it('should default missing user agents to unknown', () => {
+        const message = plainToInstance(
+            SubscriptionMessage,
+            JSON.parse('{"id":1,"method":"mining.subscribe","params":[]}')
+        );
+
+        expect(message.userAgent).toBe('unknown');
+    });
+
+    it('should respond with extranonce2 size of 8 bytes', () => {
+        const message = plainToInstance(
+            SubscriptionMessage,
+            JSON.parse('{"id":1,"method":"mining.subscribe","params":["bitaxe v2.2"]}')
+        );
+
+        expect(message.response('57a6f098')).toEqual({
+            id: 1,
+            error: null,
+            result: [
+                [['mining.notify', '57a6f098']],
+                '57a6f098',
+                8
+            ]
+        });
+    });
+});

src/models/stratum-messages/SubscriptionMessage.ts

@@ -2,6 +2,7 @@ import { Expose, Transform } from 'class-transformer';
 import { IsArray, IsString, MaxLength } from 'class-validator';
 
 import { eRequestMethod } from '../enums/eRequestMethod';
+import { EXTRANONCE2_SIZE_BYTES } from '../stratum.constants';
 import { StratumBaseMessage } from './StratumBaseMessage';
 
 export class SubscriptionMessage extends StratumBaseMessage {
@@ -32,7 +33,7 @@ export class SubscriptionMessage extends StratumBaseMessage {
                     ['mining.notify', clientId]
                 ],
                 clientId, //Extranonce1 -  Hex-encoded, per-connection unique string which will be used for coinbase serialization later. Keep it safe!
-                4 //Extranonce2_size - Represents expected length of extranonce2 which will be generated by the miner.
+                EXTRANONCE2_SIZE_BYTES //Extranonce2_size - Represents expected length of extranonce2 which will be generated by the miner.
             ]
         }
 

src/models/stratum.constants.ts

@@ -0,0 +1,3 @@
+export const EXTRANONCE1_SIZE_BYTES = 4;
+export const EXTRANONCE2_SIZE_BYTES = 8;
+export const TOTAL_EXTRANONCE_SIZE_BYTES = EXTRANONCE1_SIZE_BYTES + EXTRANONCE2_SIZE_BYTES;

src/services/bitcoin-rpc.service.ts

@@ -1,19 +1,20 @@
 import { Injectable, OnModuleInit } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
-import { RPCClient } from 'rpc-bitcoin';
+import axios, { AxiosInstance } from 'axios';
+import * as fs from 'node:fs';
 import { BehaviorSubject, filter, shareReplay } from 'rxjs';
-import { RpcBlockService } from '../ORM/rpc-block/rpc-block.service';
 import * as zmq from 'zeromq';
 
+import { RpcBlockService } from '../ORM/rpc-block/rpc-block.service';
 import { IBlockTemplate } from '../models/bitcoin-rpc/IBlockTemplate';
 import { IMiningInfo } from '../models/bitcoin-rpc/IMiningInfo';
-import * as fs from 'node:fs';
 
 @Injectable()
 export class BitcoinRpcService implements OnModuleInit {
 
     private blockHeight = 0;
-    private client: RPCClient;
+    private client: AxiosInstance;
+    private rpcRequestId = 0;
     private _newBlock$: BehaviorSubject<IMiningInfo> = new BehaviorSubject(undefined);
     public newBlock$ = this._newBlock$.pipe(filter(block => block != null), shareReplay({ refCount: true, bufferSize: 1 }));
 
@@ -30,18 +31,26 @@ export class BitcoinRpcService implements OnModuleInit {
         const port = parseInt(this.configService.get('BITCOIN_RPC_PORT'));
         const timeout = parseInt(this.configService.get('BITCOIN_RPC_TIMEOUT'));
 
-        const cookiefile = this.configService.get('BITCOIN_RPC_COOKIEFILE')
+        const cookiefile = this.configService.get('BITCOIN_RPC_COOKIEFILE');
 
         if (cookiefile != undefined && cookiefile != '') {
-            const cookie = fs.readFileSync(cookiefile).toString().split(':')
+            const cookie = fs.readFileSync(cookiefile).toString().trim().split(':');
 
-            user = cookie[0]
-            pass = cookie[1]
+            user = cookie[0];
+            pass = cookie[1];
         }
 
-        this.client = new RPCClient({ url, port, timeout, user, pass });
+        const baseURL = this.buildRpcUrl(url, port);
+        this.client = axios.create({
+            baseURL,
+            timeout,
+            auth: {
+                username: user,
+                password: pass
+            }
+        });
 
-        this.client.getrpcinfo().then((res) => {
+        this.callRpc('getrpcinfo').then(() => {
             console.log('Bitcoin RPC connected');
         }, () => {
             console.error('Could not reach RPC host');
@@ -138,13 +147,13 @@ export class BitcoinRpcService implements OnModuleInit {
 
         let blockTemplate: IBlockTemplate;
         while (blockTemplate == null) {
-            blockTemplate = await this.client.getblocktemplate({
-                template_request: {
+            blockTemplate = await this.callRpc<IBlockTemplate>('getblocktemplate', [
+                {
                     rules: ['segwit'],
                     mode: 'template',
                     capabilities: ['serverlist', 'proposal']
                 }
-            });
+            ]);
         }
 
 
@@ -155,7 +164,7 @@ export class BitcoinRpcService implements OnModuleInit {
 
     public async getMiningInfo(): Promise<IMiningInfo> {
         try {
-            return await this.client.getmininginfo();
+            return await this.callRpc<IMiningInfo>('getmininginfo');
         } catch (e) {
             console.error('Error getmininginfo', e.message);
             return null;
@@ -166,9 +175,7 @@ export class BitcoinRpcService implements OnModuleInit {
     public async SUBMIT_BLOCK(hexdata: string): Promise<string> {
         let response: string = 'unknown';
         try {
-            response = await this.client.submitblock({
-                hexdata
-            });
+            response = await this.callRpc<string>('submitblock', [hexdata]);
             if (response == null) {
                 response = 'SUCCESS!';
             }
@@ -182,5 +189,28 @@ export class BitcoinRpcService implements OnModuleInit {
         return response;
 
     }
-}
 
+    private async callRpc<T>(method: string, params: unknown[] = []): Promise<T> {
+        const response = await this.client.post('', {
+            jsonrpc: '1.0',
+            id: ++this.rpcRequestId,
+            method,
+            params
+        });
+
+        if (response.data.error != null) {
+            throw response.data.error;
+        }
+
+        return response.data.result;
+    }
+
+    private buildRpcUrl(url: string, port: number): string {
+        const normalizedUrl = /^https?:\/\//i.test(url) ? url : `http://${url}`;
+        const rpcUrl = new URL(normalizedUrl);
+        if (Number.isFinite(port) && port > 0) {
+            rpcUrl.port = port.toString();
+        }
+        return rpcUrl.toString();
+    }
+}

src/services/stratum-v1-jobs.service.spec.ts

@@ -0,0 +1,138 @@
+import { BehaviorSubject, firstValueFrom } from 'rxjs';
+
+import { MockRecording1 } from '../../test/models/MockRecording1';
+import { IMiningInfo } from '../models/bitcoin-rpc/IMiningInfo';
+import { IBlockTemplate } from '../models/bitcoin-rpc/IBlockTemplate';
+import { StratumV1JobsService } from './stratum-v1-jobs.service';
+
+describe('StratumV1JobsService', () => {
+    let miningInfo$: BehaviorSubject<IMiningInfo>;
+    let bitcoinRpcService: { newBlock$: any, getBlockTemplate: jest.Mock };
+    let service: StratumV1JobsService;
+    let consoleLogSpy: jest.SpyInstance;
+
+    const createTemplate = (height = MockRecording1.BLOCK_TEMPLATE.height): IBlockTemplate => ({
+        ...MockRecording1.BLOCK_TEMPLATE,
+        transactions: MockRecording1.BLOCK_TEMPLATE.transactions.map(tx => ({ ...tx })),
+        height
+    });
+
+    beforeEach(() => {
+        jest.useFakeTimers();
+        jest.setSystemTime(new Date(parseInt(MockRecording1.TIME, 16) * 1000));
+        consoleLogSpy = jest.spyOn(console, 'log').mockImplementation(() => undefined);
+
+        miningInfo$ = new BehaviorSubject({
+            blocks: MockRecording1.BLOCK_TEMPLATE.height
+        } as IMiningInfo);
+        bitcoinRpcService = {
+            newBlock$: miningInfo$.asObservable(),
+            getBlockTemplate: jest.fn((height: number) => Promise.resolve(createTemplate(height)))
+        };
+        service = new StratumV1JobsService(bitcoinRpcService as any);
+    });
+
+    afterEach(() => {
+        consoleLogSpy.mockRestore();
+        jest.useRealTimers();
+    });
+
+    it('should create job templates from block templates', async () => {
+        const jobTemplate = await firstValueFrom(service.newMiningJob$);
+
+        expect(jobTemplate.blockData).toEqual(expect.objectContaining({
+            id: '1',
+            height: MockRecording1.BLOCK_TEMPLATE.height,
+            clearJobs: true,
+            coinbasevalue: MockRecording1.BLOCK_TEMPLATE.coinbasevalue
+        }));
+        expect(jobTemplate.merkle_branch.length).toBeGreaterThan(0);
+        expect(jobTemplate.block.transactions[0].ins[0].witness[0]).toHaveLength(32);
+        expect(service.getJobTemplateById('1')).toBe(jobTemplate);
+    });
+
+    it('should clear jobs when the block height changes', async () => {
+        const firstTemplate = await firstValueFrom(service.newMiningJob$);
+        service.addJob({ jobId: 'old-job', creation: Date.now() } as any);
+
+        const nextTemplate = firstValueFrom(service.newMiningJob$);
+        miningInfo$.next({
+            blocks: MockRecording1.BLOCK_TEMPLATE.height + 1
+        } as IMiningInfo);
+        const jobTemplate = await nextTemplate;
+
+        expect(jobTemplate.blockData.clearJobs).toBe(true);
+        expect(service.getJobById('old-job')).toBeUndefined();
+        expect(service.getJobTemplateById(firstTemplate.blockData.id)).toBeUndefined();
+        expect(service.getJobTemplateById(jobTemplate.blockData.id)).toBe(jobTemplate);
+    });
+
+    it('should skip identical non-clean template refreshes', async () => {
+        await firstValueFrom(service.newMiningJob$);
+
+        miningInfo$.next({
+            blocks: MockRecording1.BLOCK_TEMPLATE.height
+        } as IMiningInfo);
+
+        expect(service.latestJobTemplateId).toBe(2);
+        expect(Object.keys(service.blocks)).toHaveLength(1);
+    });
+
+    it('should emit when transaction identity changes without changing transaction count', async () => {
+        await firstValueFrom(service.newMiningJob$);
+        const emissions = [];
+        const subscription = service.newMiningJob$.subscribe(jobTemplate => {
+            emissions.push(jobTemplate);
+        });
+        await Promise.resolve();
+
+        const changedTemplate = createTemplate();
+        changedTemplate.transactions[0] = {
+            ...changedTemplate.transactions[0],
+            hash: `${changedTemplate.transactions[0].hash}-changed`
+        };
+        bitcoinRpcService.getBlockTemplate.mockResolvedValueOnce(changedTemplate);
+
+        miningInfo$.next({
+            blocks: MockRecording1.BLOCK_TEMPLATE.height
+        } as IMiningInfo);
+        await Promise.resolve();
+        await Promise.resolve();
+        subscription.unsubscribe();
+        const jobTemplate = emissions[emissions.length - 1];
+
+        expect(jobTemplate.blockData.clearJobs).toBe(false);
+        expect(jobTemplate.blockData.id).toBe('2');
+        expect(service.getJobTemplateById(jobTemplate.blockData.id)).toBe(jobTemplate);
+    });
+
+    it('should age old jobs and templates after five minutes', async () => {
+        await firstValueFrom(service.newMiningJob$);
+        const oldCreation = Date.now() - (1000 * 60 * 11);
+        service.jobs['old-job'] = { jobId: 'old-job', creation: oldCreation } as any;
+        service.blocks['old-template'] = {
+            blockData: { creation: oldCreation }
+        } as any;
+
+        jest.setSystemTime(new Date(Date.now() + (1000 * 60 * 11)));
+        const nextTemplate = firstValueFrom(service.newMiningJob$);
+        miningInfo$.next({
+            blocks: MockRecording1.BLOCK_TEMPLATE.height
+        } as IMiningInfo);
+        const jobTemplate = await nextTemplate;
+
+        expect(jobTemplate.blockData.clearJobs).toBe(false);
+        expect(service.getJobById('old-job')).toBeUndefined();
+        expect(service.getJobTemplateById('old-template')).toBeUndefined();
+        expect(service.getJobTemplateById(jobTemplate.blockData.id)).toBe(jobTemplate);
+    });
+
+    it('should increment job ids when jobs are added', () => {
+        expect(service.getNextId()).toBe('1');
+
+        service.addJob({ jobId: '1', creation: Date.now() } as any);
+
+        expect(service.getNextId()).toBe('2');
+        expect(service.getJobById('1')).toEqual(expect.objectContaining({ jobId: '1' }));
+    });
+});

src/services/stratum-v1-jobs.service.ts

@@ -24,8 +24,6 @@ export interface IJobTemplate {
 @Injectable()
 export class StratumV1JobsService {
 
-    private lastIntervalCount: number;
-    private skipNext: boolean = false;
     public newMiningJob$: Observable<IJobTemplate>;
 
     public latestJobId: number = 1;
@@ -37,44 +35,61 @@ export class StratumV1JobsService {
 
     // offset the interval so that all the cluster processes don't try and refresh at the same time.
     private delay = process.env.NODE_APP_INSTANCE == null ? 0 : parseInt(process.env.NODE_APP_INSTANCE) * 5000;
+    private lastBlockHeight = 0;
+    private lastWorkSignature: string;
 
     constructor(
         private readonly bitcoinRpcService: BitcoinRpcService
     ) {
 
-        this.newMiningJob$ = combineLatest([this.bitcoinRpcService.newBlock$, interval(60000).pipe(delay(this.delay), startWith(-1))]).pipe(
+        const refreshInterval$ = this.delay > 0
+            ? interval(60000).pipe(delay(this.delay), startWith(-1))
+            : interval(60000).pipe(startWith(-1));
+
+        this.newMiningJob$ = combineLatest([this.bitcoinRpcService.newBlock$, refreshInterval$]).pipe(
             switchMap(([miningInfo, interval]) => {
                 return from(this.bitcoinRpcService.getBlockTemplate(miningInfo.blocks)).pipe(map((blockTemplate) => {
                     return {
                         blockTemplate,
-                        interval
+                        miningInfo
                     }
                 }))
             }),
-            map(({ blockTemplate, interval }) => {
+            map(({ blockTemplate, miningInfo }) => {
 
                 let clearJobs = false;
-                if (this.lastIntervalCount === interval) {
+                const currentBlockHeight = miningInfo.blocks;
+
+                if (this.lastBlockHeight == 0 || this.lastBlockHeight != currentBlockHeight) {
                     clearJobs = true;
-                    this.skipNext = true;
-                    console.log('new block')
+                    this.lastBlockHeight = currentBlockHeight;
+                    console.log('new block');
                 }
 
-                if (this.skipNext == true && clearJobs == false) {
-                    this.skipNext = false;
-                    return null;
-                }
-
-                this.lastIntervalCount = interval;
-
                 const currentTime = Math.floor(new Date().getTime() / 1000);
+                const timestamp = blockTemplate.mintime > currentTime ? blockTemplate.mintime : currentTime;
+                const workSignature = [
+                    blockTemplate.previousblockhash,
+                    blockTemplate.version,
+                    blockTemplate.bits,
+                    timestamp,
+                    blockTemplate.height,
+                    blockTemplate.coinbasevalue,
+                    ...blockTemplate.transactions.map(tx => tx.hash ?? tx.txid ?? tx.data)
+                ].join('|');
+
+                if (!clearJobs && workSignature === this.lastWorkSignature) {
+                    return null;
+                }
+                this.lastWorkSignature = workSignature;
+
                 return {
                     version: blockTemplate.version,
                     bits: parseInt(blockTemplate.bits, 16),
                     prevHash: this.convertToLittleEndian(blockTemplate.previousblockhash),
                     transactions: blockTemplate.transactions.map(t => bitcoinjs.Transaction.fromHex(t.data)),
                     coinbasevalue: blockTemplate.coinbasevalue,
-                    timestamp: blockTemplate.mintime > currentTime ? blockTemplate.mintime : currentTime,
+                    timestamp,
                     networkDifficulty: this.calculateNetworkDifficulty(parseInt(blockTemplate.bits, 16)),
                     clearJobs,
                     height: blockTemplate.height
@@ -186,5 +201,4 @@ export class StratumV1JobsService {
         return this.latestJobId.toString(16);
     }
 
-
 }

src/services/stratum-v1.service.spec.ts

@@ -0,0 +1,137 @@
+import { StratumV1Service } from './stratum-v1.service';
+
+describe('StratumV1Service', () => {
+    const originalMaster = process.env.MASTER;
+    const originalNodeAppInstance = process.env.NODE_APP_INSTANCE;
+    const originalStratumPort = process.env.STRATUM_PORT;
+    const originalBackpressureEnabled = process.env.STRATUM_BACKPRESSURE_ENABLED;
+    const originalMaxConnectionsPerListener = process.env.STRATUM_MAX_CONNECTIONS_PER_LISTENER;
+
+    let service: StratumV1Service;
+    let clientService;
+    let consoleLogSpy: jest.SpyInstance;
+    let consoleWarnSpy: jest.SpyInstance;
+
+    beforeEach(() => {
+        jest.useFakeTimers();
+        clientService = {
+            deleteAll: jest.fn().mockResolvedValue(undefined)
+        };
+        service = new StratumV1Service(
+            {} as any,
+            clientService,
+            {} as any,
+            {} as any,
+            {} as any,
+            {} as any,
+            {} as any,
+            {} as any,
+            {} as any
+        );
+        consoleLogSpy = jest.spyOn(console, 'log').mockImplementation(() => undefined);
+        consoleWarnSpy = jest.spyOn(console, 'warn').mockImplementation(() => undefined);
+    });
+
+    afterEach(() => {
+        restoreEnv('MASTER', originalMaster);
+        restoreEnv('NODE_APP_INSTANCE', originalNodeAppInstance);
+        restoreEnv('STRATUM_PORT', originalStratumPort);
+        restoreEnv('STRATUM_BACKPRESSURE_ENABLED', originalBackpressureEnabled);
+        restoreEnv('STRATUM_MAX_CONNECTIONS_PER_LISTENER', originalMaxConnectionsPerListener);
+        consoleLogSpy.mockRestore();
+        consoleWarnSpy.mockRestore();
+        jest.useRealTimers();
+    });
+
+    it('should skip Stratum listeners in the master process', async () => {
+        process.env.MASTER = 'true';
+        const startSocketServerSpy = jest.spyOn(service as any, 'startSocketServer');
+
+        await service.onModuleInit();
+        jest.runOnlyPendingTimers();
+
+        expect(clientService.deleteAll).toHaveBeenCalled();
+        expect(startSocketServerSpy).not.toHaveBeenCalled();
+        expect(consoleLogSpy).toHaveBeenCalledWith('Master process skipping Stratum socket listeners');
+    });
+
+    it('should start the Stratum listener in worker processes', async () => {
+        process.env.MASTER = 'false';
+        process.env.STRATUM_PORT = '3334';
+        const startSocketServerSpy = jest.spyOn(service as any, 'startSocketServer').mockImplementation(() => undefined);
+
+        await service.onModuleInit();
+        jest.advanceTimersByTime(10000);
+
+        expect(clientService.deleteAll).not.toHaveBeenCalled();
+        expect(startSocketServerSpy).toHaveBeenCalledWith(3334);
+    });
+
+    it('should pause listeners when worker backpressure is high', () => {
+        const close = jest.fn((callback?: (error?: Error) => void) => callback?.());
+        (service as any).listeners.push({
+            port: 3333,
+            server: { close },
+            paused: false
+        });
+        jest.spyOn(service as any, 'getEventLoopP95Ms').mockReturnValue(5000);
+        jest.spyOn(service as any, 'getBackpressureEventLoopP95Ms').mockReturnValue(2000);
+
+        (service as any).checkBackpressure();
+
+        expect(close).toHaveBeenCalled();
+        expect((service as any).listeners[0].paused).toBe(true);
+        expect((service as any).listeners[0].server).toBeNull();
+        expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('Pausing Stratum accepts'));
+    });
+
+    it('should resume listeners after consecutive healthy backpressure checks', () => {
+        (service as any).listeners.push({
+            port: 3333,
+            server: null,
+            paused: true
+        });
+        jest.spyOn(service as any, 'getEventLoopP95Ms').mockReturnValue(50);
+        jest.spyOn(service as any, 'getBackpressureEventLoopP95Ms').mockReturnValue(2000);
+        jest.spyOn(service as any, 'getBackpressureResumeEventLoopP95Ms').mockReturnValue(250);
+        jest.spyOn(service as any, 'getBackpressureResumeRssMb').mockReturnValue(Number.MAX_SAFE_INTEGER);
+        jest.spyOn(service as any, 'getBackpressureHealthyChecks').mockReturnValue(2);
+        const listenSpy = jest.spyOn(service as any, 'listen').mockImplementation((listener: any) => {
+            listener.server = {};
+            listener.paused = false;
+        });
+
+        (service as any).checkBackpressure();
+        expect(listenSpy).not.toHaveBeenCalled();
+
+        (service as any).checkBackpressure();
+
+        expect(listenSpy).toHaveBeenCalledWith((service as any).listeners[0]);
+        expect((service as any).listeners[0].paused).toBe(false);
+        expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('Resuming Stratum accepts'));
+    });
+
+    it('should cap listener connections and drop excess cluster connections', () => {
+        process.env.STRATUM_MAX_CONNECTIONS_PER_LISTENER = '250';
+        const server = {} as any;
+
+        (service as any).configureConnectionLimit(server);
+
+        expect(server.maxConnections).toBe(250);
+        expect(server.dropMaxConnection).toBe(true);
+    });
+
+    it('should allow high-volume pools by default', () => {
+        delete process.env.STRATUM_MAX_CONNECTIONS_PER_LISTENER;
+
+        expect((service as any).getMaxConnectionsPerListener()).toBe(10000);
+    });
+
+    function restoreEnv(key: string, value: string | undefined) {
+        if (value == null) {
+            delete process.env[key];
+            return;
+        }
+        process.env[key] = value;
+    }
+});

src/services/stratum-v1.service.ts

@@ -1,6 +1,7 @@
 import { Injectable, OnModuleInit } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
 import { Server, Socket } from 'net';
+import { monitorEventLoopDelay } from 'perf_hooks';
 
 import { StratumV1Client } from '../models/StratumV1Client';
 import { AddressSettingsService } from '../ORM/address-settings/address-settings.service';
@@ -8,84 +9,269 @@ import { BlocksService } from '../ORM/blocks/blocks.service';
 import { ClientStatisticsService } from '../ORM/client-statistics/client-statistics.service';
 import { ClientService } from '../ORM/client/client.service';
 import { BitcoinRpcService } from './bitcoin-rpc.service';
+import { ExternalSharesService } from './external-shares.service';
 import { NotificationService } from './notification.service';
 import { StratumV1JobsService } from './stratum-v1-jobs.service';
-import { ExternalSharesService } from './external-shares.service';
+
+interface StratumListenerState {
+    port: number;
+    server: Server | null;
+    paused: boolean;
+}
+
+const DEFAULT_BACKPRESSURE_CHECK_INTERVAL_MS = 5000;
+const DEFAULT_BACKPRESSURE_EVENT_LOOP_P95_MS = 2000;
+const DEFAULT_BACKPRESSURE_EVENT_LOOP_RESUME_P95_MS = 250;
+const DEFAULT_BACKPRESSURE_RSS_MB = 2500;
+const DEFAULT_BACKPRESSURE_RESUME_RSS_MB = 2000;
+const DEFAULT_BACKPRESSURE_HEALTHY_CHECKS = 3;
+const DEFAULT_MAX_CONNECTIONS_PER_LISTENER = 10000;
 
 
 @Injectable()
 export class StratumV1Service implements OnModuleInit {
 
-  constructor(
-    private readonly bitcoinRpcService: BitcoinRpcService,
-    private readonly clientService: ClientService,
-    private readonly clientStatisticsService: ClientStatisticsService,
-    private readonly notificationService: NotificationService,
-    private readonly blocksService: BlocksService,
-    private readonly configService: ConfigService,
-    private readonly stratumV1JobsService: StratumV1JobsService,
-    private readonly addressSettingsService: AddressSettingsService,
-    private readonly externalSharesService: ExternalSharesService
-  ) {
+    private readonly listeners: StratumListenerState[] = [];
+    private readonly eventLoopDelay = monitorEventLoopDelay({ resolution: 20 });
+    private backpressureMonitor: NodeJS.Timeout | null = null;
+    private healthyBackpressureChecks = 0;
 
-  }
+    constructor(
+        private readonly bitcoinRpcService: BitcoinRpcService,
+        private readonly clientService: ClientService,
+        private readonly clientStatisticsService: ClientStatisticsService,
+        private readonly notificationService: NotificationService,
+        private readonly blocksService: BlocksService,
+        private readonly configService: ConfigService,
+        private readonly stratumV1JobsService: StratumV1JobsService,
+        private readonly addressSettingsService: AddressSettingsService,
+        private readonly externalSharesService: ExternalSharesService
+    ) {
 
-  async onModuleInit(): Promise<void> {
+    }
 
-      if (process.env.NODE_APP_INSTANCE == '0') {
-        await this.clientService.deleteAll();
-      }
-      setTimeout(() => {
-        this.startSocketServer();
-      }, 1000 * 10)
+    async onModuleInit(): Promise<void> {
 
-  }
-
-  private startSocketServer() {
-    const server = new Server(async (socket: Socket) => {
-
-      //5 min
-      socket.setTimeout(1000 * 60 * 5);
-
-      const client = new StratumV1Client(
-        socket,
-        this.stratumV1JobsService,
-        this.bitcoinRpcService,
-        this.clientService,
-        this.clientStatisticsService,
-        this.notificationService,
-        this.blocksService,
-        this.configService,
-        this.addressSettingsService,
-        this.externalSharesService
-      );
-
-
-      socket.on('close', async (hadError: boolean) => {
-        if (client.extraNonceAndSessionId != null) {
-          // Handle socket disconnection
-          await client.destroy();
-          console.log(`Client ${client.extraNonceAndSessionId} disconnected, hadError?:${hadError}`);
+        if (process.env.NODE_APP_INSTANCE == '0' || process.env.MASTER == 'true') {
+            await this.clientService.deleteAll();
         }
-      });
 
-      socket.on('timeout', () => {
-        console.log('socket timeout');
-        socket.end();
-        socket.destroy();
-      });
+        if (process.env.MASTER == 'true') {
+            console.log('Master process skipping Stratum socket listeners');
+            return;
+        }
 
-      socket.on('error', async (error: Error) => { });
+        setTimeout(() => {
+            this.startSocketServer(this.getStratumPort());
+        }, 1000 * 10);
 
-      //   //console.log(`Client disconnected, socket error,  ${client.extraNonceAndSessionId}`);
+        this.startBackpressureMonitor();
+
+    }
+
+    private startSocketServer(port: number) {
+        const listener: StratumListenerState = {
+            port,
+            server: null,
+            paused: false
+        };
+        this.listeners.push(listener);
+        this.listen(listener);
+    }
+
+    private createSocketServer(): Server {
+        const server = new Server(async (socket: Socket) => {
+
+            //5 min
+            socket.setTimeout(1000 * 60 * 5);
+
+            const client = new StratumV1Client(
+                socket,
+                this.stratumV1JobsService,
+                this.bitcoinRpcService,
+                this.clientService,
+                this.clientStatisticsService,
+                this.notificationService,
+                this.blocksService,
+                this.configService,
+                this.addressSettingsService,
+                this.externalSharesService
+            );
 
 
-    });
+            socket.on('close', async (hadError: boolean) => {
+                if (client.extraNonceAndSessionId != null) {
+                    // Handle socket disconnection
+                    await client.destroy();
+                    console.log(`Client ${client.extraNonceAndSessionId} disconnected, hadError?:${hadError}`);
+                }
+            });
 
-    server.listen(process.env.STRATUM_PORT, () => {
-      console.log(`Stratum server is listening on port ${process.env.STRATUM_PORT}`);
-    });
+            socket.on('timeout', () => {
+                console.log('socket timeout');
+                socket.end();
+                socket.destroy();
+            });
 
-  }
+            socket.on('error', async (error: Error) => { });
+
+            //   //console.log(`Client disconnected, socket error,  ${client.extraNonceAndSessionId}`);
+
+
+        });
+
+        server.on('error', (err) => {
+            console.error(`Server error: ${err.message}`);
+        });
+        this.configureConnectionLimit(server);
+
+        return server;
+    }
+
+    private listen(listener: StratumListenerState) {
+        if (listener.server != null) {
+            return;
+        }
+
+        const server = this.createSocketServer();
+        listener.server = server;
+        listener.paused = false;
+
+        server.listen(listener.port, () => {
+            console.log(`Stratum server is listening on port ${listener.port}`);
+        });
+    }
+
+    private startBackpressureMonitor() {
+        if (this.isBackpressureDisabled() || this.backpressureMonitor != null) {
+            return;
+        }
+
+        this.eventLoopDelay.enable();
+        this.backpressureMonitor = setInterval(() => {
+            this.checkBackpressure();
+        }, this.getBackpressureCheckIntervalMs());
+    }
+
+    private checkBackpressure() {
+        const eventLoopP95Ms = this.getEventLoopP95Ms();
+        const rssMb = Math.round(process.memoryUsage().rss / 1024 / 1024);
+        const overloaded = eventLoopP95Ms >= this.getBackpressureEventLoopP95Ms()
+            || rssMb >= this.getBackpressureRssMb();
+        const paused = this.listeners.some(listener => listener.paused);
+
+        if (overloaded) {
+            this.healthyBackpressureChecks = 0;
+            if (!paused) {
+                this.pauseAccepting(eventLoopP95Ms, rssMb);
+            }
+            this.eventLoopDelay.reset();
+            return;
+        }
+
+        if (!paused) {
+            this.eventLoopDelay.reset();
+            return;
+        }
+
+        const healthy = eventLoopP95Ms <= this.getBackpressureResumeEventLoopP95Ms()
+            && rssMb <= this.getBackpressureResumeRssMb();
+        if (!healthy) {
+            this.healthyBackpressureChecks = 0;
+            this.eventLoopDelay.reset();
+            return;
+        }
+
+        this.healthyBackpressureChecks++;
+        if (this.healthyBackpressureChecks >= this.getBackpressureHealthyChecks()) {
+            this.resumeAccepting(eventLoopP95Ms, rssMb);
+            this.healthyBackpressureChecks = 0;
+        }
+
+        this.eventLoopDelay.reset();
+    }
+
+    private pauseAccepting(eventLoopP95Ms: number, rssMb: number) {
+        console.warn(`Pausing Stratum accepts: eventLoopP95Ms=${eventLoopP95Ms}, rssMb=${rssMb}`);
+        for (const listener of this.listeners) {
+            if (listener.paused || listener.server == null) {
+                continue;
+            }
+
+            const server = listener.server;
+            listener.server = null;
+            listener.paused = true;
+            server.close((error) => {
+                if (error != null) {
+                    console.error(`Error while pausing Stratum listener on port ${listener.port}: ${error.message}`);
+                }
+            });
+        }
+    }
+
+    private resumeAccepting(eventLoopP95Ms: number, rssMb: number) {
+        console.warn(`Resuming Stratum accepts: eventLoopP95Ms=${eventLoopP95Ms}, rssMb=${rssMb}`);
+        for (const listener of this.listeners) {
+            if (!listener.paused || listener.server != null) {
+                continue;
+            }
+
+            this.listen(listener);
+        }
+    }
+
+    private configureConnectionLimit(server: Server) {
+        server.maxConnections = this.getMaxConnectionsPerListener();
+        (server as Server & { dropMaxConnection: boolean }).dropMaxConnection = true;
+    }
+
+    private getEventLoopP95Ms() {
+        return Math.round(this.eventLoopDelay.percentile(95) / 1e6);
+    }
+
+    private isBackpressureDisabled() {
+        return process.env.STRATUM_BACKPRESSURE_ENABLED?.toLowerCase() === 'false';
+    }
+
+    private getBackpressureCheckIntervalMs() {
+        return this.getPositiveIntegerEnv('STRATUM_BACKPRESSURE_CHECK_INTERVAL_MS', DEFAULT_BACKPRESSURE_CHECK_INTERVAL_MS);
+    }
+
+    private getBackpressureEventLoopP95Ms() {
+        return this.getPositiveIntegerEnv('STRATUM_BACKPRESSURE_EVENT_LOOP_P95_MS', DEFAULT_BACKPRESSURE_EVENT_LOOP_P95_MS);
+    }
+
+    private getBackpressureResumeEventLoopP95Ms() {
+        return this.getPositiveIntegerEnv('STRATUM_BACKPRESSURE_EVENT_LOOP_RESUME_P95_MS', DEFAULT_BACKPRESSURE_EVENT_LOOP_RESUME_P95_MS);
+    }
+
+    private getBackpressureRssMb() {
+        return this.getPositiveIntegerEnv('STRATUM_BACKPRESSURE_RSS_MB', DEFAULT_BACKPRESSURE_RSS_MB);
+    }
+
+    private getBackpressureResumeRssMb() {
+        return this.getPositiveIntegerEnv('STRATUM_BACKPRESSURE_RESUME_RSS_MB', DEFAULT_BACKPRESSURE_RESUME_RSS_MB);
+    }
+
+    private getBackpressureHealthyChecks() {
+        return this.getPositiveIntegerEnv('STRATUM_BACKPRESSURE_HEALTHY_CHECKS', DEFAULT_BACKPRESSURE_HEALTHY_CHECKS);
+    }
+
+    private getMaxConnectionsPerListener() {
+        return this.getPositiveIntegerEnv('STRATUM_MAX_CONNECTIONS_PER_LISTENER', DEFAULT_MAX_CONNECTIONS_PER_LISTENER);
+    }
+
+    private getStratumPort() {
+        return this.getPositiveIntegerEnv('STRATUM_PORT', 3333);
+    }
+
+    private getPositiveIntegerEnv(key: string, fallback: number) {
+        const configured = parseInt(process.env[key], 10);
+        if (Number.isFinite(configured) && configured > 0) {
+            return configured;
+        }
+        return fallback;
+
+    }
 
 }

src/services/telegram.service.ts

@@ -1,8 +1,8 @@
 import { Injectable, OnModuleInit } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
+import axios, { AxiosInstance } from 'axios';
 import { validate } from 'bitcoin-address-validation';
 import { Block } from 'bitcoinjs-lib';
-import * as TelegramBot from 'node-telegram-bot-api';
 
 import { TelegramSubscriptionsService } from '../ORM/telegram-subscriptions/telegram-subscriptions.service';
 
@@ -10,7 +10,9 @@ import { TelegramSubscriptionsService } from '../ORM/telegram-subscriptions/tele
 @Injectable()
 export class TelegramService implements OnModuleInit {
 
-    private bot: TelegramBot;
+    private bot: AxiosInstance;
+    private updateOffset = 0;
+    private pollingTimer: NodeJS.Timeout;
 
     constructor(
         private readonly configService: ConfigService,
@@ -20,7 +22,10 @@ export class TelegramService implements OnModuleInit {
         if (token == null || token.length < 1) {
             return;
         }
-        this.bot = new TelegramBot(token, { polling: true });
+        this.bot = axios.create({
+            baseURL: `https://api.telegram.org/bot${token}/`,
+            timeout: 10000
+        });
         console.log('Telegram bot init');
 
 
@@ -32,23 +37,10 @@ export class TelegramService implements OnModuleInit {
             return;
         }
 
-        this.bot.onText(/\/subscribe/, async (msg) => {
-            const address = msg.text.split('/subscribe ')[1];
-            if (validate(address) == false) {
-                this.bot.sendMessage(msg.chat.id, "Invalid address.");
-                return;
-            }
-            await this.telegramSubscriptionsService.saveSubscription(msg.chat.id, address);
-            this.bot.sendMessage(msg.chat.id, "Subscribed!");
-        });
-
-        this.bot.onText(/\/start/, (msg) => {
-            this.bot.sendMessage(msg.chat.id, "Welcome to the public-pool bot. /subscribe <address> to get notified.");
-        });
-
-        this.bot.on('message', (msg) => {
-            console.log(msg);
-        });
+        await this.pollUpdates();
+        this.pollingTimer = setInterval(async () => {
+            await this.pollUpdates();
+        }, 2000);
     }
 
     public async notifySubscribersBlockFound(address: string, height: number, block: Block, message: string) {
@@ -57,8 +49,57 @@ export class TelegramService implements OnModuleInit {
         }
 
         const subscribers = await this.telegramSubscriptionsService.getSubscriptions(address);
-        subscribers.forEach(subscriber => {
-            this.bot.sendMessage(subscriber.telegramChatId, `Block Found! Result: ${message}, Height: ${height}`);
+        await Promise.all(subscribers.map(subscriber => {
+            return this.sendMessage(subscriber.telegramChatId, `Block Found! Result: ${message}, Height: ${height}`);
+        }));
+    }
+
+    private async pollUpdates() {
+        try {
+            const response = await this.bot.get('getUpdates', {
+                params: {
+                    offset: this.updateOffset,
+                    timeout: 0
+                }
+            });
+
+            for (const update of response.data.result ?? []) {
+                this.updateOffset = update.update_id + 1;
+                await this.handleMessage(update.message);
+            }
+        } catch (e) {
+            console.error('Telegram polling failed', e.message);
+        }
+    }
+
+    private async handleMessage(msg: any) {
+        if (msg?.text == null) {
+            return;
+        }
+
+        if (msg.text.startsWith('/subscribe')) {
+            const address = msg.text.split('/subscribe ')[1];
+            if (validate(address) == false) {
+                await this.sendMessage(msg.chat.id, 'Invalid address.');
+                return;
+            }
+            await this.telegramSubscriptionsService.saveSubscription(msg.chat.id, address);
+            await this.sendMessage(msg.chat.id, 'Subscribed!');
+            return;
+        }
+
+        if (msg.text.startsWith('/start')) {
+            await this.sendMessage(msg.chat.id, 'Welcome to the public-pool bot. /subscribe <address> to get notified.');
+            return;
+        }
+
+        console.log(msg);
+    }
+
+    private async sendMessage(chatId: number | string, text: string) {
+        await this.bot.post('sendMessage', {
+            chat_id: chatId,
+            text
         });
     }
 }

src/utils/difficulty.utils.ts

@@ -1,23 +1,24 @@
-import Big from 'big.js';
 import * as bitcoinjs from 'bitcoinjs-lib';
 
+const TRUE_DIFF_ONE = 2.695953529101131e67;
+
 export class DifficultyUtils {
   static calculateDifficulty(header: Buffer): { submissionDifficulty: number; submissionHash: string } {
     const hashResult = bitcoinjs.crypto.hash256(Buffer.isBuffer(header) ? header : Buffer.from(header, 'hex'));
-    const s64 = DifficultyUtils.le256todouble(hashResult);
-    const truediffone = Big('26959535291011309493156476344723991336010898738574164086137773096960');
-    const difficulty = truediffone.div(s64.toString());
+    const target = DifficultyUtils.le256todouble(hashResult);
+    const difficulty = target === 0 ? Number.POSITIVE_INFINITY : TRUE_DIFF_ONE / target;
     
     return { 
-      submissionDifficulty: difficulty.toNumber(), 
+      submissionDifficulty: difficulty,
       submissionHash: hashResult.toString('hex') 
     };
   }
 
-  private static le256todouble(target: Buffer): bigint {
-    const number = target.reduceRight((acc, byte) => {
-      return (acc << BigInt(8)) | BigInt(byte);
-    }, BigInt(0));
+  private static le256todouble(target: Buffer): number {
+    let number = 0;
+    for (let i = target.length - 1; i >= 0; i--) {
+      number = number * 256 + target[i];
+    }
     return number;
   }
 }

test/models/MockRecording1.ts

@@ -7,6 +7,6 @@ export class MockRecording1 {
     public static MINING_AUTHORIZE = `{"id": 3, "method": "mining.authorize", "params": ["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.bitaxe3", "x"]}\n`;
     public static MINING_SUGGEST_DIFFICULTY = `{"id": 4, "method": "mining.suggest_difficulty", "params": [512]}\n`;
     public static BLOCK_TEMPLATE: IBlockTemplate = { "capabilities": ["proposal"], "version": 536870912, "rules": ["csv", "!segwit", "taproot"], "vbavailable": {}, "vbrequired": 0, "previousblockhash": "00000000000000022246451e9af7ac4f8bff2527d223f6e623740e92171592f2", "transactions": [{ "data": "02000000000101c3efa41c94ee24dd6c6aaccab0f27e9d2baf92e5112bff15cc463b600e4e3a3c0100000000fdffffff024ea319000000000017a914a5b8d32a6388f02204a1445bd623150ee3b851d18765d67b000000000017a914a316e3a4eaeee9cbee9c254c3292830281a8c9c38702473044022065fbcd2918e8b52c3af8c4ae21b3646d7a12f66ddcaa73a68273f5806527c0da0220291f555dd120bb9eadb144ccf4203db659b78d79bffcd37a29016da068f3abb9012102baab4d464b57771f5108f40ffc31b7242c5b430a61d4bfead024d715c441f3f3c7432500", "txid": "a174b99a87c899e66854ba6f101799ac852ef588ec69299846875e9d64355317", "hash": "748f4db5e45dab6a9903f50e7e760470ce80ac219c637d61418667a0ccb6c536", "depends": [], "fee": 14300, "sigops": 1, "weight": 569 }, { "data": "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", "txid": "c34ac3f822a0b49f298be1a25fc9e9dd375c23985ed2656f7cf7d87b67fee1c0", "hash": "c34ac3f822a0b49f298be1a25fc9e9dd375c23985ed2656f7cf7d87b67fee1c0", "depends": [], "fee": 9153, "sigops": 12, "weight": 1408 }, { "data": "020000000001013f8e5ebf5620f2c62c9c4e4f77bb4eb903699620da372ad44f666a552e5b9fc801000000171600148442ee1fe3742153a6b40623d363a22ceed677c3ffffffff02bc0200000000000017a91470b93cf7ead31ef24b71159388c2e8e147f755b987aa0415000000000017a9145506e665bcf63e1225100d7c8613a640699fd5d087024730440220215cd74141ebcde3aee383f232dfd2c6b011645012f35714781d28d4a6959829022017ea40a15f4116bbf0a6f86dc0af08758d9a74673498a61164ed13e9d1c712e501210294184e8093958861740c4ce32e724a24b7df7eeb04702cae274652e86b01f83a00000000", "txid": "5aaf2fa707da25c24374b87d89c420c9e4c51022a4bbed4cc91614831f359366", "hash": "2c19268e65cc223c5fac9666883ecc1d10e680c54a4fdbbb3e4775f886b0feec", "depends": [], "fee": 491, "sigops": 1, "weight": 661 }, { "data": "020000000001012c53f5b0a12cadb57602466e703e60272183b75f3366073f4841dac8e616f2740000000000feffffff02e80300000000000016001496e381bd3fe4bae631adc5a5a420fb9124e5480af0a8100000000000160014cd06fc96fea44c6c5e074ba16dd20b222a0a9b32024730440220440ba2252ea6f70f1b8106897984330a997ef504f7f0dbb89679e44309026f2b02207074ad7dbd9a2bd37a41352527b7f3e68612956fe2085a0eb0b41f97f6a3599d012103b3ecf0f44126019a94a818245e35ecff1582c2900a38487a306fcd91bdb28003c8432500", "txid": "69770cf296b64329e784a5666fb0eab034fbb1780bf067f4e1606874c214f01d", "hash": "fadcaa8de64274e63c093592ed6d8c6b7584bb92c0e8d9c49f02a4df11f6f69d", "depends": [], "fee": 141, "sigops": 1, "weight": 561 }, { "data": "01000000019e03cd78895f6876932501b66eab1e44611d48b4c5029d250b7d2d6073b44b68000000006b48304502210088dfbeb842d54893987e5afb87b70fe70e7b91ebad740782515c44464b19a74202205a6bc47ad6c925f85aa29b2be1a174efcc30a4ad8ed6cfe6236b66d7a4f8d96f01210259530ee281106e237ac3aa801d1f7699ada05501186401da78b7d88849bbda8bffffffff0204ce3900000000001976a91419803f0d83a1b58348a4617c743638bbf9ec235588ac44ce5c01000000001976a9149e38aebe02be7cecacdb521f514cffe445c5533788ac00000000", "txid": "2137ca428d6233e680cea25c428b984391314d872a1a0f5f7b8dc8cfc4474c44", "hash": "2137ca428d6233e680cea25c428b984391314d872a1a0f5f7b8dc8cfc4474c44", "depends": [], "fee": 226, "sigops": 8, "weight": 904 }], "coinbaseaux": {}, "coinbasevalue": 2465717, "longpollid": "00000000000000022246451e9af7ac4f8bff2527d223f6e623740e92171592f29370", "target": "000000000000002495f800000000000000000000000000000000000000000000", "mintime": 1689512405, "mutable": ["time", "transactions", "prevblock"], "noncerange": "00000000ffffffff", "sigoplimit": 80000, "sizelimit": 4000000, "weightlimit": 4000000, "curtime": 1689514989, "bits": "192495f8", "height": 2442185, "default_witness_commitment": "6a24aa21a9edbd3d1d916aa0b57326a2d88ebe1b68a1d7c48585f26d8335fe6a94b62755f64c" };
-    public static MINING_SUBMIT = `{"id": 5, "method": "mining.submit", "params": ["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.bitaxe3", "1", "c7080000", "64b3f3ec", "ed460d91", "00002000"]}\n`;
+    public static MINING_SUBMIT = `{"id": 5, "method": "mining.submit", "params": ["tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.bitaxe3", "1", "c708000000000000", "64b3f3ec", "ed460d91", "00002000"]}`;
     public static TIME = '64b3f3ec';
 }