Bitcoin Supply Tops 20M BTC With 1M Left to Mine
Seventeen years after launch, Bitcoin has crossed a major supply milestone, with more than 20 million BTC now mined and less than one million coins left to be issued.
Seventeen years after the creation of the Bitcoin network, miners have produced over 20 million BTC, marking a major milestone in the cryptocurrency’s fixed supply schedule. The landmark was reached at block height 939,999, leaving fewer than 1 million BTC remaining to be mined before the protocol reaches its hard cap of 21 million coins.
According to Mempool.space data, the block that pushed Bitcoin’s circulating mined supply past the threshold was produced by the Foundry USA mining pool. The milestone highlights the unique design of Bitcoin’s issuance model — a system that releases new coins at a gradually declining rate through periodic halving events.
While it took roughly 17 years to mine the first 20 million BTC, the final million coins will take more than a century to be issued, underscoring the long-term scarcity embedded in Bitcoin’s monetary policy.
Bitcoin’s Fixed Supply Model
Bitcoin’s supply schedule was built into the protocol by its pseudonymous creator, Satoshi Nakamoto, when the network launched in January 2009. The system ensures that no more than 21 million BTC will ever exist, making Bitcoin fundamentally different from fiat currencies that can be expanded by central banks.
New coins are introduced through block subsidy rewards, which are paid to miners who validate transactions and secure the network.
The reward structure follows a predetermined cycle:
- 2009: Mining reward started at 50 BTC per block
- 2012: First halving reduced reward to 25 BTC
- 2016: Second halving lowered it to 12.5 BTC
- 2020: Third halving cut rewards to 6.25 BTC
- 2024: Fourth halving reduced rewards to 3.125 BTC
Each halving occurs every 210,000 blocks, which typically happens approximately every four years.
The most recent halving on April 20, 2024 sharply slowed Bitcoin’s issuance rate. Prior to the event, miners collectively generated roughly 900 BTC per day. Today, that number has dropped to around 450 BTC daily, excluding additional revenue from transaction fees.
The Final One Million BTC
With more than 95% of Bitcoin’s total supply already mined, the remaining coins will be released at an increasingly slow pace.
This is due to the exponential reduction in block rewards that occurs with each halving cycle. Over time, the block subsidy will continue to shrink until it becomes negligible.
Analysts estimate that:
- The final 1 million BTC will take over 100 years to be mined
- The smallest fractions of Bitcoin — measured in satoshis — will continue to be issued until around 2140
- At that point, Bitcoin’s maximum supply of 21 million BTC will finally be reached
According the Crypto Pulse Monitor data, the next halving event is expected around April 2028, when the reward will drop again to 1.5625 BTC per block.
Lost Bitcoins Tighten Scarcity
Although the theoretical supply cap is 21 million BTC, the number of coins actually available in circulation may be significantly lower.
Many early Bitcoin wallets have been lost over the years, either because users misplaced their private keys or sent coins to addresses that cannot be accessed. Estimates suggest that between 2 million and 3.5 million BTC may be permanently lost.
Another portion of Bitcoin’s supply is unspendable by design.
For example, the 50 BTC reward from Bitcoin’s genesis block — the first block mined by Satoshi Nakamoto — cannot be spent due to how it was created in the protocol.
These permanently inaccessible coins effectively reduce the true circulating supply, reinforcing Bitcoin’s reputation as a form of digital hard money with strong scarcity characteristics.
A Gradual Shift Toward Fee-Based Mining
As Bitcoin’s issuance slows over time, the network’s economic model will gradually shift.
Currently, miners earn revenue through two sources:
- Block subsidies (newly issued BTC)
- Transaction fees paid by users
However, once the final Bitcoin is mined around 2140, miners will no longer receive new coins. Instead, transaction fees alone will serve as the incentive to maintain network security.
This transition has been widely discussed within the Bitcoin community. Some observers question whether transaction fees alone will provide sufficient economic incentive to sustain mining operations.
Others argue that as Bitcoin adoption grows and the network becomes a global settlement layer, transaction fees could become substantial enough to support miners and maintain network security.
A Milestone in Bitcoin’s Monetary History
The crossing of the 20 million BTC mark serves as a reminder of Bitcoin’s unique monetary design — one that prioritizes predictability, scarcity, and long-term supply discipline.
Unlike traditional financial systems where money supply can change rapidly, Bitcoin follows a fully transparent and mathematically enforced issuance schedule. Every block mined moves the network closer to its final supply cap.
While the remaining one million coins will take more than a century to emerge, the milestone highlights how far the network has come since its humble beginnings in 2009 — and how its fixed supply continues to shape the narrative around Bitcoin as digital gold in the modern financial system.
