rich1.0npub1g5zswf6y48f7fy90jf3tlcuwdmjn8znhzaa4vkmtxaeskca8hpss23ms3lhttps://nostr.ae/npub1g5zswf6y48f7fy90jf3tlcuwdmjn8znhzaa4vkmtxaeskca8hpss23ms3lnjumphttps://nostr.ae📅 Original date posted:2019-12-17 📝 Original message: Good morning David, t-bast, and all, > I'm not aware of any way to currently force single-show signatures in > Bitcoin, so this is pretty theoretical. Also, single-show signatures > add a lot of fragility to any setup and make useful features like RBF > fee bumping unavailable. With `OP_CAT`, we can enforce that a particular `R` is used, which allows to implement single-show signatures. # Assuming signatures are the concatenation of (R,s) <R> OP_SWAP OP_CAT <ACINQ> OP_CHECKSIG The above would then feed `s` only on the witness stack. Regards, ZmnSCPxj