bitcoin core – How to increment the number of confirmation of a transaction?

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    A tx will only be included in a single block in any given blockchain.

    Confirmations is simply a count of how many new blocks extend the chain.

    If your tx is in block n, it has 1 confirmation. When block n+1 is mined, you need to check that the prevblockhash is the hash of block n. If it is, you now have 2 confirmations, since the chain has been mined. When block n+2 is mined, you check the prevblockhash against the hash of block n+1. If this is valid, you now have 3 confirmations, since block n+1 builds upon the block with your tx, and block n+2 builds upon block n+1. You can keep checking this for as many blocks as you feel necessary to guarantee that your tx will not be dropped. Most wallets/exchanges check until a tx has 6 confirmations.



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