What is a Block Confirmation on Ethereum?

Jared Stauffer
2 min readFeb 22, 2019


When I send ETH, why do I have to wait for confirmations? What is a block confirmation?

A sample block confirmation section of a transaction from etherscan.io.

When you send ETH from a wallet address to another, you are submitting a transaction to the Ethereum blockchain. The transaction sits in a que of sorts and is then added to the blockchain by miners (or validators). The block that your transaction is added in to becomes its’ first block confirmation.

A block confirmation is simply the act of your transaction being included in a block on the blockchain.

Therefore, if your transaction has 13 block confirmations (see above graphic), then there have been 12 blocks mined since the block was mined that included your transaction.

Why is this important? The more blocks that are mined (committed to the blockchain) after your transaction is committed to a block, the greater the chance your transaction is done and irreversible.

Generally, a transaction is considered a success (or completed) after six block confirmations.

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