Bitcoin surpasses 20 million mined, reaching 95% of total supply

Bitcoin just crossed a milestone that puts its scarcity model into sharp relief. More than 20 million BTC have now been mined, representing over 95% of all Bitcoin that will ever exist. The remaining supply, fewer than 1 million coins, will trickle out over the next century-plus thanks to the protocol’s built-in halving mechanism.

The 20 millionth coin was minted on approximately March 9, near block height 940,000, by the Foundry USA mining pool. It arrived roughly 17 years and 6,267 days after Satoshi Nakamoto produced the genesis block in January 2009.

The math of engineered scarcity

Bitcoin’s supply schedule is one of the few things in crypto that has worked exactly as advertised since day one. The protocol caps total issuance at 21 million coins, with mining rewards cut in half roughly every four years. Following the April 2024 halving, the current issuance rate sits at approximately 450 BTC per day.

To put the remaining timeline in perspective: it took less than two decades to produce 95% of all Bitcoin. The final 5% will take until approximately 2140 to fully mine.

What this means for miners

Bitcoin miners currently earn revenue from two sources: block rewards (newly minted BTC) and transaction fees paid by users. Today, block rewards still dominate that equation. But with each successive halving, the balance shifts.

The implication is straightforward. Miners will increasingly depend on transaction fees to justify the energy and hardware costs of securing the network. If fees don’t scale up proportionally as rewards decline, some miners could find operations unprofitable. That could lead to a reduction in hashrate, which in turn raises questions about network security.

The next halving isn’t expected until 2028, and block rewards will remain meaningful for several more cycles. Foundry USA, the pool that mined the milestone block, is itself a reflection of the trend toward institutional-scale mining operations.

Supply scarcity meets growing demand

The supply side of Bitcoin’s equation is now firmly established. Over 95% of all coins are in circulation, and new issuance is slowing to a crawl. Bitcoin’s fixed supply has long been its core value proposition for investors who view it as a digital alternative to gold. With fewer new coins entering the market each day, any sustained increase in demand hits a shrinking pool of available supply.

Gold miners can open new mines when prices rise. Oil producers can drill more wells. Bitcoin miners can throw all the hardware they want at the network and it won’t produce a single extra coin beyond the protocol’s schedule. The difficulty adjustment makes sure of that.

There’s also the question of effective supply. Of the 20 million coins now mined, a significant portion is estimated to be permanently lost, sitting in wallets whose keys have been forgotten, destroyed, or buried on hard drives in landfills. The actual circulating supply available for trading is meaningfully lower than the headline number suggests.

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