> I would like to know people's sentiment about doing (a very slightly tweaked
> version of) BIP118 in place of (or before doing) BIP119.
NACK for the below reasons:
- Premature idea
- I do not find use cases interesting
- We are still in research phase of implementing covenants in bitcoin and
looking for the best proposal
- Taproot soft fork was recently activated and its too soon
- Not enough documentation available
- Could not find any pull request in core for BIP 118 that can be reviewed
- Not enough tools available for testing
pushd
---
parallel lines meet at infinity?
------- Original Message -------
On Friday, April 22nd, 2022 at 5:30 PM,
bitcoin-dev-requ...@lists.linuxfoundation.org wrote:
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> 1. ANYPREVOUT in place of CTV (darosior)
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 22 Apr 2022 11:11:41 +0000
> From: darosior daros...@protonmail.com
>
> To: Bitcoin Protocol Discussion
> bitcoin-dev@lists.linuxfoundation.org
>
> Subject: [bitcoin-dev] ANYPREVOUT in place of CTV
> Message-ID:
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>
> 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
>
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> End of bitcoin-dev Digest, Vol 83, Issue 40
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