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Date: Sun, 2 Oct 2022 16:12:10 +1000
From: Anthony Towns <aj@erisian.com.au>
To: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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Subject: Re: [bitcoin-dev] bitcoin-inquistion: evaluating soft forks on
signet
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On Fri, Sep 16, 2022 at 05:15:45PM +1000, Anthony Towns via bitcoin-dev wrote:
> So that's the concept. For practical purposes, I haven't yet merged
> either CTV or APO support into the bitcoin-inquisition 23.0 branch yet
I've now merged CTV and updated my signet miner to enforce both CTV and
APO (though you'd need to be either lucky or put some effort into it to
figure out how to get a CTV/APO transaction relayed to my miner).
Updating APO to be compatible with CTV actually seems to have found a
previously unknown bug in the CTV PR against core [0], so that seems
productive at the very least.
[0] https://github.com/bitcoin-inquisition/bitcoin/pull/8
https://github.com/bitcoin/bitcoin/pull/21702#pullrequestreview-1118047730
I've also mined a couple of test APO transactions [1]; both reusing an
APOAS signature [2], including demonstrating the case where a third party
can replay APO signatures to send funds from duplicate UTXOs to fees,
by spending those UTXOs in a single tx [3] [4].
[1] https://mempool.space/signet/address/tb1pesae595q3cpzp8j3gy07gussw9t9hh580xj027sfz6g8e530u3nqscn0yn
[2] "ec764a8ed632916868ca6dbfdc5bed95f74b83be62d01397aba7ec916982c6721c923fa22d29b5e0c4fddde0148233f0cf401758df23d8cc89c88f04beffc3c3c1" -- sighash of 0xc1 = ANYPREVOUTANYSCRIPT|ALL
https://mempool.space/signet/tx/ee6f6eda93a3d80f4f65f2e1000334132c9a014b3ed3dec888fdcc1f3441f52c
https://mempool.space/signet/tx/2cbcc4857e6ee8510d9479c01fbf133a9a2cde3f5c61ccf9439c69b7b83334ba
[3] https://github.com/bitcoin/bips/blob/master/bip-0118.mediawiki#Signature_replay
[4] https://mempool.space/signet/tx/53a9747546e378956072795351e8436cf704da72d235c8ac7560787b554a4d3f
Cheers,
aj
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