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To: Russell O'Connor <roconnor@blockstream.com>
From: ZmnSCPxj <ZmnSCPxj@protonmail.com>
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Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Unlimited covenants,
was Re: CHECKSIGFROMSTACK/{Verify} BIP for Bitcoin
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Good morning Russell,
> On Sun, Jul 4, 2021 at 9:02 PM Russell O'Connor <roconnor@blockstream.com=
> wrote:
>
> > Bear in mind that when people are talking about enabling covenants, we =
are talking about whether OP_CAT should be allowed or not.
> >
> > That said, recursive covenants, the type that are most worrying, seems =
to require some kind of OP_TWEAK operation, and I haven't yet seen any evid=
ence that this can be simulated with CHECKSIG(FROMSTACK).=C2=A0 So maybe we=
should leave such worries for the OP_TWEAK operation.
>
> Upon further thought, you can probably make recursive covenants even with=
a fixed scritpubkey by sneaking the state into a few bits of the UTXO's am=
ount.=C2=A0 Or if you try really hard, you may be able to stash your state =
into a sibling output that is accessed via the txid embedded in the prevout=
point.
Which is kind of the point of avoiding giving too much power, because peopl=
e can be very clever and start doing unexpected things from what you think =
is already a limited subset.
"Give an inch and they will take a mile".
Still, as pointed out, altcoins already exist and are substantially worse, =
and altcoin implementations are all going to run on Turing machines anyway =
(which are powerful enough to offer Turing-machine functionality), so maybe=
this is not really giving too much power, people can already fork Bitcoin =
and add full EVM support on it.
Regards,
ZmnSCPxj
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