About block 900,000
Bitcoin block 900,000 was mined by ViaBTC on June 6, 2025 at 5:41 AM UTC, 5 min 10 s after block 899,999. That is faster than the 10-minute average the network aims for: blocks come in bursts because finding one is pure chance.
It confirmed 1,562 transactions in 1.92 MB (78.3% of the 4 million weight-unit limit). The median transaction paid 2.00 sat/vB, and all fees added up to 0.0179 BTC. With the 3.125 BTC subsidy of halving era 5, ViaBTC earned 3.1429 BTC for this block.
Block 900,000 is number 865 of 2,016 in difficulty epoch 446; 1,151 blocks remain until the next difficulty adjustment at block 901,151. The next halving is at block 1,050,000, 150,000 blocks after this one.
Its hash starts with 19 zeros: that is the proof of work, a number below the target that the whole network’s hashrate had to search for. ViaBTC found 91 blocks in the week before. Today the block has 75,978 confirmations, so it is settled beyond any practical doubt.
Why block 900,000 is notable
Height 900,000 is a round milestone, one of the multiples of 10,000 that mark the chain’s progress. Consensus rules ignore round numbers, so nodes checked this block exactly like its neighbours, but heights like this are useful reference points. It arrived 16.4 years after the genesis block of 3 January 2009, an average of 9 min 36 s per block across the whole chain up to that point. From here, 100,000 blocks remained to block 1,000,000: about 694 days at the 10-minute target.
Of the 3.14291835 BTC that ViaBTC collected for this block, 3.125 BTC was new subsidy and 0.01791835 BTC came from fees, 0.6% of the total; leaving out the coinbase, its 1,561 transactions paid about 1,148 sats each on average.
Countdown to block 1,000,000 →
What’s inside a Bitcoin block
Every block, 900,000 included, is made of the same parts:
- Header
- Eighty bytes that miners hash over and over: the version, the hash of the previous block, the Merkle root that summarises every transaction, a timestamp, the difficulty target in compact form and a nonce. A block is valid when the hash of its header falls below the target.
- Coinbase transaction
- The first transaction, written by the miner. It spends no inputs: it creates the subsidy and collects the fees, and since BIP 34 it must also record the block height.
- Transactions
- Everything else in the block: payments taken from the mempool, usually picked by fee rate because space is capped at 4 million weight units. Block 900,000 holds 1,562, counting the coinbase.
- Fees
- The difference between what each transaction spends and what it creates. The miner claims them in the coinbase; they are the part of the reward set by demand rather than by the protocol.
- Subsidy
- New bitcoin created by the block, fixed by the halving schedule: 50 BTC at the start, halved every 210,000 blocks. At height 900,000 it is 3.125 BTC.