New answers tagged replace-by-fee
2
In order to be valid for replacement the challenger must have a higher feerate than (all) the conflicting transactions(s) and pay more absolute fees than (all) the conflicting transaction(s) and all its(/their) descendants.
In your example whether TXA2 will be accepted and replace TXA + TXB depends on the size of each (to deduce their absolute fee).
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