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Child Pays For Parent (CPFP) is a technique for increasing the effective feerate of an unconfirmed transaction by spending one of its outputs in a high feerate transaction, encouraging miners to include both transactions in a block.

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Spending output of a low-fee transaction by following with higher-fee transaction

To my knowledge there is not a widespread practice of miners to do this, but it certainly can be programmed. As transaction fees continue to rise and these type of stuck transaction become more of a …
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