RBF: Replace-By-Fee explained simply:
TLDR:
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Transactions are sent to the mempool, awaiting confirmation
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Low-fee tx can remain unconfirmed in the mempool.
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Use Replace-By-Fee to resend the tx with a higher fee => this will improve its chances of being picked up by miners
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RBF allows tx to be replaced in the mempool by setting nSequence to a value below 0xffffffff => This signals the transaction can be replaced with a higher-fee version.