Functionality such as this does not currently exist not because no one thought of it before, but because it has been proposed many times before and determined to be harmful. The existing design of CLTV/CSV were carefully constructed to make it impossible for a transaction to go from valid to invalid based on the time. The most naive construction-- e.g. push the current time/height on the stack-- would have that property and was specifically avoided.
When a spend goes from valid to invalid it means that a reorganization will destroy coins even completely absent any dishonest actions of the coins prior owner in the coins recent casual history. Effectively a coin with any kind of non-monotone validity event in its recent history functions like a recently generated coin: a coin that reorgs destroy. Bitcoin addresses the issue for recently generated coins by not permitting their use for 100 blocks. I've yet to see an argument for a use case for non-monotone validity that still sounds useful once the negative effects are addressed (e.g. by subjecting coins that have gone through them to a maturity limitation). _______________________________________________ bitcoin-dev mailing list firstname.lastname@example.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev