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Date: Thu, 20 Mar 2025 00:27:36 +0000
From: Peter Todd <pete@petertodd.org>
To: bitcoindev@googlegroups.com
Subject: [bitcoindev] Standard Unstructured Annex
Message-ID: <Z9tg-NbTNnYciSOh@petertodd.org>
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I'm working on adding support for the taproot annex to Libre Relay:
https://github.com/petertodd/bitcoin/commit/04c8e449a34e74e048bf5751d13592a=
22763ff7e
I'm basing this on Joost Jager's pull-req: https://github.com/bitcoin/bitco=
in/pull/27926
Specifically, transactions containing taproot annexes will be standard
if:
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.
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.
An example of a transaction meeting these requirements is:
010000000001011a559447098aaa14dec0c62ea55f43f9ce6bda07d1759f11b634334ab9da9=
39b0000000000ffffffff010000000000000000076a05616e6e657802406840b6fa27a00ba0=
01cc92797ce4f3ab7b7a32c21d1fce49e893b42e506bd92e8db187966a84ef799915cf67133=
4cc59779915b192bfb66b2afcf384bb61d0f422500049276d20616e20616e6e657821204172=
6520796f7520616e20616e6e65783f0000000000
--=20
https://petertodd.org 'peter'[:-1]@petertodd.org
--=20
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