Solo Bitcoin miner wins full block reward of ‎3.173 BTC

A solo Bitcoin miner won the full block reward of ‎3.173 BTC using a small-scale mining rig with 2.3 petahash per second (PH/s).  

Mempool Space website showed that the solo miner known as Solo CK won a total of $349,028 worth of Bitcoin subsidy and fees after solving block number 903,883. The miner netted ‎3.10918096 BTC, equivalent to $338,105 after paying the pool’s fees of 0.06345267 BTC.

The miner won the Bitcoin block reward through the CKpool platform while running hardware with a hashrate of 2.3 PH/s. The CKpool dev and admin, Con Kolivas, posted about the achievement of the solo miner on X and congratulated him. 

This solo miner beat incredible odds

At around 2.3 PH/s, Solo CK controlled a tiny fraction of the global Bitcoin network hashrate, which ranges between 600 and 700 EH/s (exahash per second). Statistically, this translates to a ~0.004% chance per day of finding a block—which equates to Con Kolivas’ calculation of “once every 8 years” average.

The log output shared by the CKpool admin on X showed that the solo miner’s rig averaged ~2.3 PH/s over the past hour and between ~2.17 to 2.22 PH/s over the past 1 to 7 days prior to solving the block. This average hashrate is considered high for a solo miner, suggesting a powerful setup roughly equivalent to the output of 10 Antminer S21 units.

The log also showed that the block difficulty was at 941 trillion, and the solo miner submitted about 79.6 trillion shares (or attempts) before solving the block. This equates to 68% of the expected effort needed to solve a Bitcoin block, meaning the solo miner solved the block earlier than average. 

Solo miners solved many Bitcoin blocks this year

This is not the first time a solo miner hits the jackpot and takes the full Bitcoin block reward. 

In February 2025, a solo miner solved block number 883,181 and won 3.125 BTC block, which was worth over $300,000. A Bitcoin miner said on X that the winner used an implementation of the CKPool and speculated the usage of Bitaxe.

In March another solo miner solved block number 887,212 and won around 3.15 BTC, equal to $263,000 at the time. Con Kolivas shared the news on X and said the miner used a 480 GH/s Bitaxe device to solve the block with a hashrate of just 3.3 TH/s on CKpool. 

Such a miner has less than a 1-in-a-million chance of finding a block per day — meaning, on average, it would take about 3,500 years to discover one.

Bitaxe is a DIY open-source Bitcoin miner often used by hobbyists. It’s made with a single ASIC chip, typically from the Antminer S9 series and has a hashrate of around 480 GH/s.

On June 5th, a solo miner won $330,000 after mining block number 899,826 and getting 3.125 BTC. The miner obtained the block rewards through the CKpool and used a high hashrate of 259 PH/s, which is based on a rental basis from a cloud service. 

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