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Date: Wed, 5 Jun 2019 19:30:39 +1000
From: Anthony Towns <aj@erisian.com.au>
To: Jeremy <jlrubin@mit.edu>,
Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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X-Mailman-Approved-At: Wed, 05 Jun 2019 14:26:19 +0000
Subject: Re: [bitcoin-dev] OP_SECURETHEBAG (supersedes OP_CHECKOUTPUTSVERIFY)
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On Fri, May 31, 2019 at 10:35:45PM -0700, Jeremy via bitcoin-dev wrote:
> OP_CHECKOUTPUTSHASHVERIFY is retracted in favor of OP_SECURETHEBAG*.
I think you could generalise that slightly and make it fit in
with the existing opcode naming by calling it something like
"OP_CHECKTXDIGESTVERIFY" and pull a 33-byte value from the stack,
consisting of a sha256 hash and a sighash-byte, and adding a new sighash
value corresponding to the set of info you want to include in the hash,
which I think sounds a bit like "SIGHASH_EXACTLY_ONE_INPUT | SIGHASH_ALL"
FWIW, I'm not really seeing any reason to complicate the spec to ensure
the digest is precommitted as part of the opcode.
Cheers,
aj
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