Whenever a transaction is added to a block, it receives 1 confirmation. If a block is added to the blockchain after the block in which your transaction is, the transaction would have 2 confirmations. If a block is added after this block, your transaction will have 3 confirmations, and this continues on and on. It is recommended to wait for at least 6 confirmations to be 99.9% sure that your transaction will not be canceled – it takes about 1 hour.
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