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Bitcoin learning guide
Published by Crypto Dispensers · 6 min read
Bitcoin supply explained
Start with the cap, then separate the coins already issued from the coins still to come. None of those numbers tells you what Bitcoin will be worth.
Each bar is half the height of the one before it. The chart shows the subsidy schedule, not Bitcoin prices or your investment returns.
Know which number you are reading
The maximum supply is not the same thing as the amount available to buy today.
The familiar 21 million figure describes the cap under the current issuance rules. It is not a count of coins already in circulation.
Coins enter through block subsidies. A dated supply total should identify its block height or measurement time and explain what it counts.
Some holders are not selling. Some keys are lost. The amount offered in a market can be much smaller than the amount recorded on the blockchain.
This page intentionally does not present a static number as a live supply counter. A figure copied today will change as new blocks arrive. If you compare two dashboards, first check their timestamps and definitions.
Lost keys do not cause the network to issue replacement coins. At the same time, an address that has not moved for years is not proof that its owner has lost access. A claim about the exact number of lost coins is an estimate, not a direct count.
The issuance rule
The subsidy began at 50 BTC per block. On Bitcoin mainnet, its limit is cut in half every 210,000 blocks. The rule is based on block height, not a calendar appointment.
| Era begins at block | Maximum new BTC per block |
|---|---|
| 0 | 50 BTC |
| 210,000 | 25 BTC |
| 420,000 | 12.5 BTC |
| 630,000 | 6.25 BTC |
| 840,000 | 3.125 BTC |
| 1,050,000 | 1.5625 BTC |
Blocks target an average interval of about ten minutes, so an era is roughly four years. Actual block times vary. That is why the next halving has an exact block height but only an estimated date.
A miner can collect the allowed new subsidy plus transaction fees in the block. Fees move existing BTC from users to miners. They do not increase the supply. Nodes check these limits and reject a block that pays too much.
As the subsidy gets smaller, integer rounding at the satoshi level eventually takes it to zero. The common expectation is around 2140, not a guaranteed date. The ending of new issuance does not mean existing Bitcoin stops moving; fees remain part of the transaction system.
Technical basis: Bitcoin Core subsidy and block validation and mainnet timing and halving parameters.
A supply rule is not a price promise
Knowing how many coins can be issued does not tell you what someone will pay for them.
Demand, liquidity, regulation and market confidence can change. A fixed cap does not make Bitcoin a dependable inflation hedge or protect the money you invest.
The schedule is public. A reduction in new issuance does not guarantee a price jump, a profitable entry point or a repeat of a previous market cycle.
Supply rules do not protect your recovery phrase, prevent scams or remove provider risk. How you hold Bitcoin matters separately from how it is issued.
A useful reading habit is to separate three questions: What does the protocol allow? What are people willing to pay? What risks would you personally take? Treating those as one question is how a factual supply number can become an unsupported sales pitch.
Learn the distinction between inflation and purchasing power, then review the Bitcoin buying safety checklist before making a purchase. This guide is educational, not an investment recommendation.
Common questions
Bitcoin has a cap of 21 million under its current rules, but not all have been issued. A current issued supply figure needs a timestamp or block height. It should not be confused with coins available for sale or coins whose keys are still accessible.
Yes. One BTC is divided into 100 million satoshis. A smaller unit does not increase the total amount of Bitcoin, just as dividing a dollar into cents does not create more dollars. Read the guide to buying part of a bitcoin for examples.
Not for nodes that continue enforcing the existing rules. Miners produce blocks, but nodes validate them independently. A change that permits more issuance would require participants to adopt different rules; it cannot be imposed on unchanged validating nodes by one company or miner.
No issuance rule requires transactions to stop when the subsidy reaches zero. Existing coins can still move and fees can still compensate miners. The future economics and security of that system depend on conditions that cannot be guaranteed today.
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Check the source
Reviewed September 16, 2026. The code links use a specific release so the cited implementation remains inspectable.
Supply is one part of understanding Bitcoin. Explore the network, learn what a wallet does and understand the purchase process before deciding whether to proceed.
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Compare Bitcoin buying options →Published by Crypto Dispensers, which offers crypto buying, selling and swapping services. This article is educational. Bitcoin prices can fall; fees, timing, eligibility and available services vary. Review the applicable terms before you transact.
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