I would like to know people's sentiment about doing (a very slightly tweaked version of) BIP118 in place of (or before doing) BIP119.
SIGHASH_ANYPREVOUT and its precedent iterations have been discussed for over 6 years. It presents proven and implemented usecases, that are demanded and (please someone correct me if i'm wrong) more widely accepted than CTV's. SIGHASH_ANYPREVOUTANYSCRIPT, if its "ANYONECANPAY" behaviour is made optional [0], can emulate CTV just fine. Sure then you can't have bare or Segwit v0 CTV, and it's a bit more expensive to use. But we can consider CTV an optimization of APO-AS covenants. CTV advocates have been presenting vaults as the flagship usecase. Although as someone who've been trying to implement practical vaults for the past 2 years i doubt CTV is necessary nor sufficient for this (but still useful!), using APO-AS covers it. And it's not a couple dozen more virtual bytes that are going to matter for a potential vault user. If after some time all of us who are currently dubious about CTV's stated usecases are proven wrong by onchain usage of a less efficient construction to achieve the same goal, we could roll-out CTV as an optimization. In the meantime others will have been able to deploy new applications leveraging ANYPREVOUT (Eltoo, blind statechains, etc..[1]). Given the interest in, and demand for, both simple covenants and better offchain protocols it seems to me that BIP118 is a soft fork candidate that could benefit more (if not most of) Bitcoin users. Actually i'd also be interested in knowing if people would oppose the APO-AS part of BIP118, since it enables CTV's features, for the same reason they'd oppose BIP119. [0] That is, to not commit to the other inputs of the transaction (via `sha_sequences` and maybe also `sha_amounts`). Cf https://github.com/bitcoin/bips/blob/master/bip-0118.mediawiki#signature-message. [1] https://anyprevout.xyz/ "Use Cases" section _______________________________________________ bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
