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Is it possible to give an expiration time to a Bitcoin transaction so that after a definite time, it can no longer be mined?

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No, bitcoin transactions that stop being valid after a certain point in time are not possible

  • Out of curiosity, are there proposed opcodes such as OP_PUSHTXDATA from Johnson Lan which allow for an expiration mechanism? There is no timestamp on the transaction, so specifically OP_PUSHTXDATA wouldn't allow to construct an expiration mechanism. Instead, this hypothetical op_code that would enable expiration would need the ability to push the header height to the stack ... anything such proposals so far? – James C. Jan 26 at 12:57

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