Bitcoin’s Issued Supply Crossed 17 Million BTC

Bitcoin’s widely tracked issued-supply count crossed 17 million BTC on April 26, 2018, marking a visible checkpoint in the network’s predetermined monetary schedule. CoinMarketCap’s historical snapshot recorded 17,000,825 BTC in circulating supply, while contemporaneous reporting identified the passage of the 17 million threshold during the same date.

The milestone mattered because Bitcoin’s issuance was governed by shared protocol rules rather than an issuer’s discretionary decision. Dividing 17 million by Bitcoin’s headline 21 million ceiling gives approximately 80.95%, leaving roughly four million BTC to be issued under an increasingly slow subsidy schedule. That calculation describes programmed issuance, not the amount readily available for trading.

Block 520,000 anchors the record

Blockchain.com’s explorer dates Bitcoin block 520,000 to April 26, 2018 at 10:40:17, without displaying an explicit timezone in the surviving page. The explorer attributes the block to AntPool and records 1,829 transactions, a 12.5 BTC base subsidy and 0.66194152 BTC in transaction fees. The total coinbase reward was therefore 13.16194152 BTC, but only the 12.5 BTC subsidy represented newly issued bitcoin; fees transferred existing coins.

Block 520,000 is a useful public anchor for the milestone, although references to a singular “17 millionth bitcoin” are necessarily simplified. Bitcoin is divisible into 100 million satoshis, blocks create batches rather than individual numbered coins, and miners have not always claimed every satoshi permitted by the subsidy rules. Consequently, theoretical scheduled supply, actually claimed subsidies and a data provider’s circulating-supply estimate can differ slightly.

The schedule was visible in running code

Bitcoin Core version 0.16.0 was the current major release on April 26, 2018. Its validation code calculated the permitted block subsidy from block height and the consensus halving interval. The schedule began at 50 BTC per block and reduced the subsidy by half every 210,000 blocks. After the second reduction at height 420,000 in July 2016, the permitted subsidy was 12.5 BTC per block.

Using that schedule, the first 210,000 heights permitted 10.5 million BTC and the next 210,000 permitted another 5.25 million. A further 100,000 blocks at 12.5 BTC accounted for another 1.25 million, bringing the nominal cumulative allowance to 17 million around height 520,000. This is a calculation from the consensus schedule, not a claim that every allowed unit remained spendable or economically circulating.

The remaining supply was not scheduled to arrive at the earlier pace. Future halvings would continue reducing issuance, making the 17 million checkpoint a demonstration of the declining supply curve rather than a countdown of four million coins arriving over the next several years.

Bitcoin was rising, but the milestone did not cause the move

CoinMarketCap’s April 26 snapshot placed BTC at $9,281.51, up 4.40% over the provider’s displayed trailing 24-hour window and 11.88% over seven days. It reported market capitalization of $157.79 billion and 24-hour volume of $8.97 billion. Those were cross-venue aggregate figures, not an official closing auction, and the surviving snapshot does not disclose a precise observation time or complete historical venue methodology.

Kraken’s separate daily report listed BTC at $9,085, up 1.14% under the exchange’s reporting methodology, with $155 million traded in its bitcoin markets and $352 million across all Kraken markets. The difference from CoinMarketCap reflects distinct venue coverage, timing and calculation methods.

No causal connection between the supply milestone and the price increase can be established from these records. Issuance was predictable, and market participants could calculate the threshold in advance. What April 26 established was more durable: Bitcoin’s live network continued executing a transparent supply policy that participants could independently inspect, calculate and verify.