The Brief

Bitcoin’s network mined its 20 millionth coin on March 9 at block height 939,999, meaning 95.24 percent of the cryptocurrency’s fixed 21 million supply now exists. The remaining one million coins will take approximately 114 years to produce, with the final satoshi expected around 2140.

The Report

The Foundry USA mining pool collected the 3.125 BTC block reward that pushed Bitcoin’s cumulative issuance past the 20 million mark on March 9, seventeen years, two months, and one week after Satoshi Nakamoto mined the genesis block in January 2009. The milestone passed without ceremony — no announcement, no protocol change, just a hash and a number ticking over on a network that has run without interruption since its inception.

The arithmetic of what remains is stark. At the current issuance rate of roughly 450 BTC per day, approximately one million coins are left to enter circulation. But the halving mechanism — which cuts the block reward in half every 210,000 blocks, or roughly every four years — ensures that pace will decelerate sharply. The next halving, projected for April 2028, will reduce the reward to 1.5625 BTC. By the 2040s, daily issuance will fall below 30 BTC. By the 2060s, below two. Bitcoin’s annualised supply inflation already runs below one percent, lower than gold’s estimated 1.5 to 2 percent annual growth.

The effective scarcity is considerably tighter than the headline numbers suggest. Research from Chainalysis and River Financial estimates that between 2.3 and 3.7 million BTC are permanently lost — forgotten keys, destroyed hardware, Nakamoto’s estimated 1.1 million unmoved coins. Glassnode data classifies roughly 13 million BTC as illiquid, held by long-term investors or in cold storage. Only about 3 million BTC currently sit on exchanges.

“We have officially entered the ‘Era of Scarcity,’ where over 95% of the total supply is already in circulation,” said Thomas Perfumo, Kraken’s chief economist. “The 21 million cap isn’t a policy. It isn’t a gentleman’s agreement. It is code.”

The milestone arrives during a period of significant structural transition for the mining industry. Needham & Company’s John Todaro predicts that a large portion of publicly traded miners will sell down nearly all their Bitcoin holdings before year-end 2026, redirecting capital expenditure toward AI workloads where operating margins exceed 80 percent, compared with margins near breakeven for many mining operations at current hash prices. Strategy alone now holds seven times more Bitcoin than all public miners combined.

Bitcoin traded around $69,000 to $71,000 through the week of the milestone, approximately 44 percent below its October 2025 all-time high of $126,080. Corporate holdings reached 999,210 BTC — roughly 5 percent of circulating supply — with Strategy’s recent acquisition of 17,994 BTC at an average price of $70,946 accounting for the week’s largest single purchase. U.S. spot ETFs recorded $1.45 billion in net inflows over five trading days in early March, a notable reversal after months of sustained outflows.

The market showed no significant price movement on the milestone itself. The next halving is twenty-five months away.

The Angle

The interesting thing about this milestone is not what it says about Bitcoin. It is what it says about the concept it was built to test: whether scarcity can be engineered from first principles and hold.

Every previous scarce monetary asset — gold, silver, land — derived its scarcity from physical constraints that were themselves subject to change. Gold supply expands when extraction technology improves or when someone finds a new deposit. Land supply is fixed until someone builds upward or reclaims coastline. The scarcity was always contingent on the limits of human capability at a given moment. Bitcoin inverted this. Its scarcity is not a function of what humans cannot yet do. It is a function of what the protocol will not permit, regardless of capability. Twenty million coins exist not because that is all the network could produce in seventeen years, but because the code said so. The distinction is structural, and it has now survived four halvings, a $126,000 peak, a 52 percent crash, and every flavour of geopolitical crisis the last decade could produce.

The miners pivoting to AI infrastructure tell a subtler story than the obvious one about margins. What is actually happening is that the physical apparatus built to secure a mathematically scarce monetary network turns out to be almost perfectly suited to powering the compute demands of artificial intelligence. The energy sourcing, the cooling infrastructure, the site selection expertise, the relationships with grid operators — all of it transfers. The mining industry spent a decade building the world’s most efficient distributed energy-to-computation pipeline, and the next use case arrived before the first one finished. Whether this represents diversification or migration depends on which side of the 2028 halving you are standing on.

The number worth sitting with is not 20 million or one million. It is three million — the approximate quantity of Bitcoin actually available for purchase on exchanges, against a backdrop of 59 million millionaires worldwide and a growing list of corporations and sovereign entities accumulating positions. The supply question was settled in 2009 when Nakamoto published the whitepaper. The demand question is the one being answered now, and the answer is arriving considerably faster than the remaining coins.