What is Confirmation?
Crypto Glossary Definition
A transaction is considered to be confirmed once it has been written to the blockchain. If a transaction has multiple confirmations, it means that additional blocks have been mined after the block that contains the transaction in question. The higher the confirmation number, the more certainty that a coin has not been double spent.
Why Confirmation Matters
A confirmation is each additional block mined on top of the one containing your transaction — more confirmations mean it's progressively harder for that transaction to be reversed, which is why exchanges typically wait for several confirmations before crediting a large deposit.
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