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Date: Sat, 8 Mar 2025 07:16:37 +1000
From: Anthony Towns <aj@erisian.com.au>
To: Antoine Riard <antoine.riard@gmail.com>
Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
Subject: Re: [bitcoindev] "Recursive covenant" with CTV and CSFS
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On Wed, Mar 05, 2025 at 02:46:08PM -0800, Antoine Riard wrote:
> > I don't believe the existence of a construction like this poses any
> > problems in practice, however if there is going to be a push to activate
> > BIP 119 in parallel with features that directly undermine its claimed
> > motivation, then it would presumably be sensible to at least update
> > the BIP text to describe a motivation that would actually be achieved by
> > deployment.
> I do...
> https://gnusha.org/pi/bitcoindev/f594c2f8-d712-48e4-a010-778dd4d0cadb@Spark/
> https://blog.bitmex.com/txwithhold-smart-contracts/
I don't believe being able to pay for censorship on-chain is any more
threatening than being able to pay for censorship off-chain.
The bitmex blog post there relies on having a trusted oracle to release
DLC payments if the target tx wasn't mined. If you have that level of
trust anyway, then just putting funds in escrow, having miners register
bolt12 invoices with the oracle, and having the oracle make the payments
when it's satisfied blocks are sufficiently confirmed has a pretty
similar risk profile.
> With OP_CHECKSIGFROMSTACK, which is iirc <signature> <pubkey> <message>
It's <signature> <message> <pubkey> with pubkey at the top of the stack.
https://github.com/bitcoin/bips/blob/master/bip-0348.md
The same is also true of both Elements' CSFS and Bitcoin-Cash's CHECKDATASIG.
Cheers,
aj
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