Solo Miner Finds Bitcoin Block 903,883
A miner using roughly 2.3 PH/s of hashrate found Bitcoin block 903,883 through CKPool, an unusually lucky result in an era dominated by industrial-scale mining. The event became a small but memorable reminder that solo mining remained possible even as the network's total hashrate had grown enormously.
In early July 2025, a solo Bitcoin miner connected through CKPool found block 903,883 while operating at roughly 2.3 petahashes per second. The miner received the block subsidy and transaction fees associated with the block, producing a payout worth several hundred thousand dollars at the time. The event drew attention because the miner's hashrate was tiny compared with the total computing power securing the Bitcoin network.
Bitcoin mining had become overwhelmingly industrial by 2025. Large public and private operators deployed fleets of specialized ASIC machines across purpose-built facilities, while a miner with only a few petahashes per second represented a microscopic fraction of global hashrate. Solo mining therefore resembled a lottery: the protocol does not guarantee that the largest miner will find the next block, but the probability of success rises in proportion to hashrate. A very small participant can still occasionally produce the winning proof of work.
The block did not change Bitcoin's mining economics or network rules, but its historical value was human and illustrative. At a time when Bitcoin mining was commonly discussed as an industry of public companies, megawatt-scale facilities, and global energy contracts, block 903,883 showed that the underlying probabilistic mechanism still left room for a very small participant to find a block.