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To: Johnson Lau <jl2012@xbt.hk>
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Cc: bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org>,
Pieter Wuille <pieter.wuille@gmail.com>
Subject: Re: [bitcoin-dev] Taproot proposal
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Good morning Johnson,
> > > Some way to sign an additional script (not committed to by the witnes=
s
> > > program) seems like it could be a trivial addition.
> >
> > It seems to me the annex can be used for this, by having it contain bot=
h the script and the signature somehow concatenated.
>
> This is not possible since the whole annex is signed. It is possible if t=
he signed =E2=80=9Cscript=E2=80=9D does not require further input, like per=
-input lock-time, relative lock-time, check block hash
I understand, you are correct.
Possibly the correct way would be to use another leaf version.
The "script" of such a new leaf version would not actually be a script, but=
a delegation key.
Then for this leaf version the actual script and signature from the delegat=
ion key attesting that script would be on top of the witness stack that wil=
l be used by the actual script.
This has the nice property that the existence of a delegation key is hidden=
from the output, and that if an alternate script is in the MAST (as an alt=
ernative to the delegation), use of that alternate script does not reveal t=
hat delegation could have been possible.
Regards,
ZmnSCPxj
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