The Bitcoin (BTC) network has crossed the 20 million coin threshold — meaning 95.2% of the cryptocurrency's hard-capped 21 million supply is now in circulation, with the final 1 million coins set to trickle out over the next 114 years due to the protocol's built-in halving mechanism.
What Happened: 20M BTC Milestone
The milestone was flagged by Polymarket on Mar. 9, noting that mining the remaining supply will stretch until approximately the year 2140.
It took roughly 17 years to produce the first 20 million coins.
The halving — a pre-programmed event that slashes miner rewards in half every four years — ensures the rest will come far more slowly.
When Bitcoin launched, miners earned 50 BTC per block. After four halvings, that reward now stands at 3.125 BTC. The next cut will bring it down to 1.5625 BTC, and the cycle will repeat until the last fraction of a coin is issued.
Complicating the supply picture further, an estimated 3 to 4 million coins are considered permanently lost — locked away by forgotten passwords, burnt addresses and misplaced hard drives.
Also Read: Bitcoin Exchange Reserves Hit 2019 Lows — What Comes Next?
Why It Matters: Supply Pressure Grows
The milestone sharpens the scarcity argument that has drawn institutional buyers into the market.
Wall Street money managers and corporations have been accumulating BTC through spot ETFs and direct balance sheet purchases, putting pressure on an already thin liquid supply.
Once block rewards eventually reach zero, the network will transition entirely to a fee-based security model. Layer-2 networks are already treating the main blockchain as a premium settlement layer, driving transaction fee revenue higher and offering miners an alternative income stream for the post-reward era.