Block 903,883 — solo-mined on 3 Jul 2025
Solo CKPool · 3.1726 BTC
Bitcoin block 903,883 was solo-mined on 3 July 2025 on Solo CKPool at a reported 6 TH/s, for a block reward of 3.1726 BTC. It is one of the 44 blocks in the Solo Block Record as of , every one verified on the chain itself.
About 0.0000007% of the network's hashrate — press put the per-block odds near 1 in 180 million — and the 3.17 BTC coinbase still landed on a 6 TH/s desktop machine.
Key facts
| Date | |
|---|---|
| Block height | 903,883 |
| Pool (coinbase tag) | Solo CKPool |
| Hardware | ~6 TH/s desktop ASIC |
| Hashrate | 6 TH/s as reported |
| Network difficulty | 116.96 T |
| Block reward | 3.1726 BTC |
| Value, as reported | ≈ $265,000 then |
| Expected time to a block | 2,700 years |
| Chance on any given day | 1 in 970,000 |
| On-chain | mempool.space |
| Source | Tom's Hardware |
The odds
At that day's difficulty, a rig this size expected one block every 2,700 years — about 1 in 970,000 on any given day.
That is the one formula behind every odds line in the record: the network difficulty at that height, times 2³², divided by the reported hashrate — the expected time between blocks for that rig. Odds like these are why solo mining is a lottery, not a paycheck. Run the same math for your own hardware on the odds calculator.
Check it yourself
The date, the reward and the pool tag are read from the chain itself: open block 903,883 on mempool.space to check them. Hardware and hashrate are as reported at the time; this entry's source is Tom's Hardware.
Quick answers
Who found block 903,883? The record does not name the miner. Block 903,883 was solo-mined on 3 Jul 2025 on Solo CKPool, reportedly on ~6 TH/s desktop ASIC at 6 TH/s. The entry's source is Tom's Hardware.
How was this record verified? The date, the reward and the pool tag were read from the chain itself, at block 903,883 on mempool.space. Hardware and hashrate are as reported at the time, by the source above. The entry is part of the Solo Block Record, version 2026-10-28, open data under CC BY 4.0.
An open record
This block is one entry in Solo Legends, the Solo Block Record: 44 solo-mined Bitcoin blocks found mostly by small or home miners, each one verified on-chain. The whole record is open data — blocks.json · blocks.csv — licensed CC BY 4.0: use it anywhere, including commercially, as long as you say where it came from. Cite it as SoloLuck.io, “The Solo Block Record”, version 2026-10-28, https://sololuck.io/legends. Something wrong or missing? Tell us.
Solo odds are the same on every pool: your hashrate against the whole network's. See yours on the odds calculator, compare solo pools, or point a miner at SoloLuck — true-solo, with a 0% fee.