About block 917,921
Bitcoin block 917,921 was mined by Foundry USA on October 6, 2025 at 3:55 PM UTC, 4 min 17 s after block 917,920. That is faster than the 10-minute average the network aims for: blocks come in bursts because finding one is pure chance.
It confirmed 3,770 transactions in 1.64 MB (99.8% of the 4 million weight-unit limit). The median transaction paid 6.00 sat/vB, down from 8.00 sat/vB in the block before, and all fees added up to 0.0690 BTC. With the 3.125 BTC subsidy of halving era 5, Foundry USA earned 3.1940 BTC for this block.
Block 917,921 is number 642 of 2,016 in difficulty epoch 455; 1,374 blocks remain until the next difficulty adjustment at block 919,295. The next halving is at block 1,050,000, 132,079 blocks after this one.
Its hash starts with 20 zeros: that is the proof of work, a number below the target that the whole network’s hashrate had to search for. Foundry USA found 265 blocks in the week before. Today the block has 55,657 confirmations, so it is settled beyond any practical doubt.