Public Pool

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Solo Bitcoin mining pool

stratum+tcp://public-pool-web.airdns.org:21496
username: <your BTC address>.<worker name>, password: x

Pleb mining (under 10TH/s miners) mine with NO FEES*
Miners with > 10TH/s will incur a 1.5% fee, a portion of which will go back into open source Bitcoin mining*

No second best.
* Based on a machine-by-machine basis