Emre Yumlu 
The Bitcoin network has reached another historic milestone. The total number of mined coins has surpassed 20 million BTC, bringing the digital asset significantly closer to its fixed maximum supply of 21 million. This moment once again highlights one of Bitcoin’s defining characteristics: its built-in scarcity.
Unlike traditional fiat currencies, whose supply can be expanded by central banks, Bitcoin follows a predetermined issuance schedule embedded in its protocol. The rules governing its monetary policy are transparent and publicly verifiable, allowing anyone to monitor how new coins enter circulation. Because these rules are deeply integrated into the network, altering them would require an overwhelming consensus across the ecosystem.
Most of Bitcoin Supply Is Already in Circulation
According to blockchain data, more than 95% of the total Bitcoin supply has already been mined. In practical terms, this means that slightly over 20 million BTC are now in circulation across the network.
The remaining coins—approximately one million BTC—will enter circulation much more slowly. This is largely due to Bitcoin’s halving mechanism, a built-in event that occurs roughly every four years. During each halving, the reward miners receive for adding a new block to the blockchain is reduced by 50%.
Because of this process, Bitcoin’s supply growth continues to slow over time. As the network matures, mining new coins becomes progressively more difficult and less frequent. Current projections suggest that the final Bitcoin will likely be mined around the year 2140.
Digital Scarcity Becomes More Visible
Bitcoin’s capped supply is one of the main reasons it is often compared to gold. The predictable reduction in new supply has led many investors to view Bitcoin as a potential hedge against inflation or monetary expansion.
However, the theoretical supply of 21 million coins does not fully reflect the amount that is actually available in the market. Industry estimates suggest that millions of BTC may already be permanently lost due to forgotten private keys, inaccessible wallets, or lost storage devices. As a result, the effective circulating supply could be significantly lower than the maximum cap.
Why the Final One Million Bitcoin Matters
Bitcoin’s most recent halving took place in 2024, when the block reward dropped from 6.25 BTC to 3.125 BTC. The next halving is expected to occur in roughly two years, further slowing the pace at which new coins are introduced.
At present, around 450 BTC are mined each day. Given this rate, only a relatively small portion of the remaining supply will enter the market over the rest of the decade.
The gradual reduction in block rewards will also reshape the economics of Bitcoin mining. Over time, transaction fees are expected to become an increasingly important source of revenue for miners. This transition may play a key role in sustaining the long-term security and functionality of the Bitcoin network.
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