From: Chris Stewart <stewart.chris1234@gmail•com>
To: Sjors Provoost <sjors@sprovoost•nl>
Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>,
jeremy <jeremy.l.rubin@gmail•com>
Subject: Re: [bitcoindev] Consensus Cleanup BIP draft
Date: Fri, 28 Mar 2025 06:02:46 -0500 [thread overview]
Message-ID: <CAGL6+mE8JQGJErgJH03sz8Nzo+wkgx74jgFWp7hFT0MuHiPg_g@mail.gmail.com> (raw)
In-Reply-To: <17A67D4A-3EF4-4676-8356-B1DE6B0C2D8D@sprovoost.nl>
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Hi Sjors,
An example is any segwit transaction that 1 input 1 output that pays to a 2
byte witness program. Since witness data doesn't count towards the 64 byte
limit, the witness could be of arbitrary size. This was pointed out
<https://delvingbitcoin.org/t/great-consensus-cleanup-revival/710/74?u=chris_stewart_5>
by garlonicon <https://delvingbitcoin.org/u/garlonicon> on delvingbitcoin.
This type of witness program is used for pay-to-anchor outputs currently -
although I don't believe anchor outputs make sense in a 1 input 1 output
transaction? The author of pay to anchor outputs is aware of this issue
<https://delvingbitcoin.org/t/great-consensus-cleanup-revival/710/78?u=chris_stewart_5>,
but I haven't heard of any further updates since his post on delving.
-Chris
On Fri, Mar 28, 2025 at 4:25 AM Sjors Provoost <sjors@sprovoost•nl> wrote:
>
> > Op 27 mrt 2025, om 21:45 heeft jeremy <jeremy.l.rubin@gmail•com> het
> volgende geschreven:
> >
> > I'm also personally strongly against removing 64-byte transactions. It's
> a wart in how transactions work, and future upgrades (especially around tx
> programmability) might integrate very poorly with this kind of edge
> condition.
>
> Do you have an example in mind where a 64-byte transaction could appear in
> such a system?
>
> Given the limited space, in particular no room for a public key or
> signature, I could imagine a burn or anyone-can-spend clause. Those don't
> have to be exactly 64 bytes. Even if 64 byte transactions are generated by
> accident, I believe they can be tweaked after the fact (though that claim
> could use more scrutiny):
>
> https://bitcoin.stackexchange.com/q/125971/4948
>
> If we grant that any smart contract system has to engineer around this
> "ward", we should also consider how much engineering effort is saved in
> other smart contract systems by having simpler SPV proofs.
>
> Imo the real ward is the originally broken Merkle tree design. That has
> required a bunch of engineering all over the place to compensate. Afaik it
> can only be truly fixed with a hard fork. This seems to be as good as it
> gets with a soft fork.
>
> - Sjors
>
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>
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next prev parent reply other threads:[~2025-03-28 14:34 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-26 17:14 'Antoine Poinsot' via Bitcoin Development Mailing List
2025-03-27 10:46 ` Chris Stewart
2025-03-27 17:54 ` /dev /fd0
2025-03-27 19:05 ` 'Antoine Poinsot' via Bitcoin Development Mailing List
2025-03-27 20:45 ` jeremy
2025-03-27 21:38 ` 'Antoine Poinsot' via Bitcoin Development Mailing List
2025-03-28 9:23 ` Sjors Provoost
2025-03-28 11:02 ` Chris Stewart [this message]
2025-03-28 12:48 ` Sjors Provoost
2025-03-28 13:54 ` Chris Stewart
2025-03-28 14:07 ` Sjors Provoost
2025-03-28 19:53 ` eric
2025-03-29 11:02 ` Sjors Provoost
2025-03-31 11:00 ` Anthony Towns
2025-03-31 15:29 ` 'Antoine Poinsot' via Bitcoin Development Mailing List
2025-03-31 20:09 ` eric
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