How many bitcoins exist? Supply, issuance and lost coins
Learn how Bitcoin’s supply rule works, why the maximum is below 21 million, how new bitcoin is issued, and why lost bitcoin cannot be counted precisely.
Direct answer
Bitcoin’s rules cap total issuance below 21 million bitcoin, but the ledger cannot reliably label which issued bitcoin remains spendable or has been lost.
Bitcoin has a supply rule built into its consensus rules. The block subsidy started at 50 bitcoin per block and is reduced at scheduled intervals. Because of the way the subsidy is calculated in satoshis, the total issuance approaches, but does not reach, 21 million bitcoin.[2]
How many bitcoins can exist?
Bitcoin’s consensus rules cap total issuance below 21 million bitcoin. The subsidy started at 50 bitcoin per block and is reduced at scheduled intervals; because it is calculated in whole satoshis, total issuance approaches but does not reach 21 million.[2]
What is the difference between maximum, issued and circulating supply?
Maximum supply is the protocol’s upper issuance limit. Issued supply describes bitcoin created under the subsidy rule. A circulating-supply figure is a measurement choice and may not equal bitcoin that is currently spendable.
The ledger records outputs and spending conditions, not whether a holder still controls the required keys.
Why is Bitcoin’s maximum below 21 million?
The block subsidy is denominated in satoshis, Bitcoin’s smallest unit. Subsidy reductions eventually reach zero because the amount is rounded down in whole satoshis, leaving the technical upper bound slightly below 21 million bitcoin.[2]
How does new bitcoin enter circulation?
New bitcoin enters circulation through the block subsidy paid under Bitcoin’s consensus rules. The subsidy changes by block height rather than on a fixed calendar date.
A fixed issuance rule does not establish a future price, demand level, liquidity level or outcome for a holder. Supply is a network property, not a forecast. The Bitcoin halving explained article covers the event mechanics and miner-reward components.
Why cannot lost bitcoin be counted precisely?
The ledger does not label an output as lost. A holder may keep keys offline, use long-term custody, or choose not to move bitcoin for a long time, so lost-bitcoin figures are estimates rather than a precise protocol count.
When reading a supply chart, check what it measures: issued bitcoin, an estimate of circulating supply, exchange balances or inactive outputs can answer different questions.
Frequently asked questions
Is the circulating supply the same as spendable bitcoin?
No. A circulating-supply figure is a measurement choice, while the ledger cannot reliably identify which issued bitcoin remains spendable. BIP 42 defines the issuance rule, not a lost-coin count.
Can anyone know exactly how much bitcoin has been lost?
No. The ledger records spending conditions, not whether a holder still controls the required keys. Lost-bitcoin figures are estimates rather than a precise protocol count.
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