i like this.

but how "baked in" to the protocol is locktime? ie it will forever be compatible with whatever official client is in use in 15 or 20 years time? a tx created with locktime today will always work in the future?

sorry for noob question i just know btc slowly mutates as needed, and 15-20 years is a long time. as long as the locktime behavior is set in stone..

@Robot1982 i like that unix timestamp bit more than using block height, thanks.