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From: Ethan Heilman <eth3rs@gmail.com>
Date: Sat, 1 Jun 2024 08:34:16 -0400
Message-ID: <CAEM=y+Xa4NbDzU7Ag_zYEPvcmGneco5o71vY_W29AnLJZqq5cA@mail.gmail.com>
Subject: Re: [bitcoindev] AOPP 2.0 using OP_CAT and OP_CSFS
To: "/dev /fd0" <alicexbtong@gmail.com>
Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
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It seems like you could do this today, no new opcodes, if you made the
pubkey identity check interactive rather than purely on-chain.
I'd imagine anyone building such a system would want to make it interactive
so they could revoke leaked keys and have an expiration mechanism.
On Fri, May 31, 2024, 10:29 PM /dev /fd0 <alicexbtong@gmail.com> wrote:
> Hi Bitcoin Developers,
>
> I have been following the conversation in BIP 322 thread:
> https://groups.google.com/g/bitcoindev/c/RCi1Exs0ZvQ/m/vp6Xo36aBwAJ and
> did some research about all the undesirable things we can do with proposed
> opcodes.
>
> I think its possible to create a worse protocol in which withdrawal is
> done to a personally identifying string. It can only be claimed by the user
> if they generate a public key and get it certified by an identity verifier.
>
> ```
> (pushes from scriptsig: certsig, bpubkey, txsig, 0)
> IF (certsig, bpubkey, txsig)
> <recovery_pubkey> -skip-
> CHECKSIGVERIFY -skip-
> <recovery_time> -skip-
> CHECKLOCKTIMEVERIFY -skip-
> ELSE
> OVER (certsig, bpubkey, txsig, bpubkey)
> CHECKSIGVERIFY (certsig, bpubkey,)
> SHA256 (certsig, SHA256(bpubkey),)
> <id> (certsig, SHA256(bpubkey), id)
> CAT (certsig, SHA256(bpubkey)|id)
> <tpubkey> (certsig, SHA256(bpubkey)|id, tpubkey)
> CHECKDATASIG (1)
> ENDIF
> ```
>
> CHECKDATASIG would be replaced by CHECKSIGFROMSTACK if testing on signet.
>
> Here's the link to read more about it:
> https://gist.github.com/markblundeberg/bd28871548108fc66d958018b1bde085
>
> /dev/fd0
> floppy disk guy
>
> --
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<div dir=3D"auto">It seems like you could do this today, no new opcodes, if=
you made the pubkey identity check interactive rather than purely on-chain=
.<div dir=3D"auto"><br></div><div dir=3D"auto">I'd imagine anyone build=
ing such a system would want to make it interactive so they could revoke le=
aked keys and have an expiration mechanism.</div></div><br><div class=3D"gm=
ail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, May 31, 2024, 10:2=
9 PM /dev /fd0 <<a href=3D"mailto:alicexbtong@gmail.com">alicexbtong@gma=
il.com</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Bitcoin De=
velopers,<div><br></div><div>I have been following the conversation in BIP =
322 thread:=C2=A0<a href=3D"https://groups.google.com/g/bitcoindev/c/RCi1Ex=
s0ZvQ/m/vp6Xo36aBwAJ" target=3D"_blank" rel=3D"noreferrer">https://groups.g=
oogle.com/g/bitcoindev/c/RCi1Exs0ZvQ/m/vp6Xo36aBwAJ</a> and did some resear=
ch about all the undesirable things we can do with proposed opcodes.</div><=
div><br></div><div>I think its possible to create a worse protocol in which=
withdrawal is done to a personally identifying string. It can only be clai=
med by the user if they generate a public key and get it certified by an id=
entity verifier.</div><div><br></div><div>```<br></div><div>(pushes from sc=
riptsig: =C2=A0certsig, bpubkey, txsig, 0)<br>IF =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(certsig, bpubkey, txsi=
g)<br>=C2=A0 <recovery_pubkey> =C2=A0 =C2=A0 -skip-<br>=C2=A0 CHECKSI=
GVERIFY =C2=A0 =C2=A0 =C2=A0 =C2=A0-skip-<br>=C2=A0 <recovery_time> =
=C2=A0 =C2=A0 =C2=A0 -skip-<br>=C2=A0 CHECKLOCKTIMEVERIFY =C2=A0 -skip-<br>=
ELSE<br>=C2=A0 OVER =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
=C2=A0(certsig, bpubkey, txsig, bpubkey)<br>=C2=A0 CHECKSIGVERIFY =C2=A0 =
=C2=A0 =C2=A0 =C2=A0(certsig, bpubkey,)<br>=C2=A0 SHA256 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(certsig, SHA256(bpubkey),)<br>=C2=A0=
<id> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(=
certsig, SHA256(bpubkey), id)<br>=C2=A0 CAT =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (certsig, SHA256(bpubkey)|id)<br>=C2=A0 <=
;tpubkey> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (certsig, SHA256(bpu=
bkey)|id, tpubkey)<br>=C2=A0 CHECKDATASIG =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0(1)<br>ENDIF<br>```</div><div><br></div><div>CHECKDATASIG would be repla=
ced by CHECKSIGFROMSTACK if testing on signet. <br><br>Here's the link =
to read more about it:=C2=A0<a href=3D"https://gist.github.com/markblundebe=
rg/bd28871548108fc66d958018b1bde085" target=3D"_blank" rel=3D"noreferrer">h=
ttps://gist.github.com/markblundeberg/bd28871548108fc66d958018b1bde085</a><=
/div><div><br></div><div>/dev/fd0</div><div>floppy disk guy</div><div><br><=
/div>
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