Subject: Re: [bitcoindev] AOPP 2.0 using OP_CAT and OP_CSFS

From: Ethan Heilman <[email-masked]>
Date: Sat, 1 Jun 2024 08:34:16 -0400

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 <[email-masked]> 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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