Input-triggered transaction expiry
summary
Proposal names an input-triggered expiry that makes expiries immune to free relay by invalidating spends based on the confirmed age of the input rather than wall-clock expiry. It enforces coin-age via sequence-number logic (BIP68) with a bit 21 SICA flag holding an absolute height plus a required confirmation-age R (open whether R needs a minimum like 100). Concrete use: expiring HTLCs that prevent replacement-cycling without mempool visibility; pseudo-CLRTs and miner-payments are sketched. It’s a protocol proposal with worked-through validation rules, not yet a network deployment.
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chapters (6)
- 0:00Defining bitcoin expiry
- 4:03Free relay and expiry
- 8:03Input triggered expiry proposal
- 17:15Expiring HTLC applications
- 24:35Pseudo CLRT implementation
- 31:45Miner rewards and conclusion
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