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authorPeter Todd <pete@petertodd.org>2025-03-24 16:17:46 +0000
committerbitcoindev <bitcoindev@googlegroups.com>2025-03-24 15:00:58 -0700
commit6958757613cae9ff6ce41329f11e04b92fc258e1 (patch)
tree8d21ecff532eb6ad844d96836e71be24779ddf93
parentaad004a95730e9e07da57aa1e12f6ef540bea38e (diff)
downloadpi-bitcoindev-6958757613cae9ff6ce41329f11e04b92fc258e1.tar.gz
pi-bitcoindev-6958757613cae9ff6ce41329f11e04b92fc258e1.zip
Re: [bitcoindev] Re: Standard Unstructured Annex
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+Date: Mon, 24 Mar 2025 16:17:46 +0000
+From: Peter Todd <pete@petertodd.org>
+To: Antoine Riard <antoine.riard@gmail.com>
+Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
+Subject: Re: [bitcoindev] Re: Standard Unstructured Annex
+Message-ID: <Z-GFqu7bfDGdLSa-@petertodd.org>
+References: <Z9tg-NbTNnYciSOh@petertodd.org>
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+
+On Thu, Mar 20, 2025 at 03:47:16PM -0700, Antoine Riard wrote:
+> Hi Peter,
+>
+> See also that can be relevant for taproot annex support:
+> https://github.com/bitcoin/bips/pull/1381
+
+Thanks.
+
+> > 1) All non-empty annexes start with the byte 0x00, to distinguish them
+> > from consensus-relevant annexes. This ensures that any use of the
+> > annex will not conflict with future soft-forks that may assign
+> > meaning to the annex.
+>
+> So IIUC, it would be 1-byte: 0x00 | <random_data payload>.
+
+Correct.
+
+When annex data finally does get a consensus meaning any encoding scheme
+starting with a non-zero byte will be compatible. Most likely we'll get
+some tag-length-value encoding scheme.
+
+Applications already using annexes who want to also take advantage of
+new consensus features will of course have to upgrade their encoding
+schemes to match. But I think that's fine.
+
+> > 2) All inputs have an annex. This ensures that use of the annex is
+> > opt-in, preventing transaction pinning attacks in multi-party
+> > protocols. This requirement may be relaxed in the future, eg to allow
+> > spends of keyless outputs, and/or if RBF for witness-only
+> > replacements is implemented.
+>
+> I think it's good to start with all inputs have an annex. It avoids
+> the kind of issue, like what if the annex size is inflated to downgrade
+> the feerate of the multi-party transaction (e.g to have a coinjoin
+> stucking in network mempools).
+
+Glad to hear you agree.
+
+> One thing that might be missed, without having looked to the code, is
+> potentially a policy transaction-relay rule to limit the max size of the
+> annex, to avoid the same concern than above. There shouldn't be max
+> limit for now, as normally the annex is not standard at all as a taproot
+> data field.
+
+Libre Relay has no limit on OP_Return output size; I'm not going to
+artificially limit annex usage either. The requirement to opt-in to
+annex usage should be sufficient.
+
+There is a possibility of a multi-party, annex-using, protocol where
+someone does a pinning attack by re-signing their transaction with a
+bigger annex. But witness-RBF in combination with replace-by-fee-rate
+will fix this, so I'm not concerned. No such protocols actually exist
+yet anyway, so we can figure that out later.
+
+--
+https://petertodd.org 'peter'[:-1]@petertodd.org
+
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