A confirmation is the inclusion of a transaction in a block. Each new block added after it counts as one more confirmation and makes the transaction harder to reverse. Bitcoin.org calls six confirmations the minimum for high-value bitcoin transfers, as of September 2026. With blocks about every 10 minutes on average, that takes about an hour, sometimes much longer.
How do blockchain confirmations work?
The first confirmation comes when a miner or validator adds the transaction to a block; each block added on top counts as one more. Before that, it waits in the mempool.
Each block stores a fingerprint (hash) of the one before it, linking the blockchain. Changing a confirmed transaction means rewriting its block and every later block, so each confirmation makes reversal harder.
How many confirmations are enough?
There is no fixed number; each recipient decides based on the amount at risk. For Bitcoin, bitcoin.org rates 1 confirmation as somewhat reliable, 3 as mostly reliable and 6 as the minimum for high-value transfers (as of September 2026).
| Network | New block about every | Common guidance |
|---|---|---|
| Bitcoin | 10 minutes (average) | 1 to 3 for small amounts; 6 or more for high-value transfers |
| Litecoin | 2.5 minutes (target) | Each recipient sets its own number |
| Ethereum (proof of stake) | 12 seconds (one slot) | A block is finalized after about 15 minutes |
Example: how long do 6 confirmations take?
On Bitcoin, about an hour on average, but sometimes much longer: blocks are found at random, so any one can come much sooner or later (bitcoin.org). On Litecoin, 6 blocks at the 2.5-minute target take about 15 minutes.
To check the count, paste the TXID (transaction ID) into a block explorer.
Why do confirmations matter when you buy crypto?
Crypto is delivered to the wallet address you provide. Like any on-chain transfer, it usually shows as pending in your wallet until confirmed. A busy network or a relatively low network fee can make that wait longer. See blockchain delays and confirmations, or buy crypto on Coinmama.
What are the risks and red flags?
- Unconfirmed is not final. A pending transaction can still be replaced or dropped, so do not treat it as received.
- Confirmed is permanent. Only the recipient can send the funds back, so check the address and network before you send.
- Ignore “speed-up” offers. Nobody needs your seed phrase to confirm a transaction. See how to protect yourself from fraud.
Go deeper: Can blockchain transactions be reversed?
