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Date: Sun, 24 Mar 2024 15:36:30 -1000
From: "David A. Harding" <dave@dtrt.org>
To: Peter Todd <pete@petertodd.org>
Cc: =?UTF-8?Q?Martin_Habov=C5=A1tiak?= <martin.habovstiak@gmail.com>,
bitcoindev@googlegroups.com
Subject: Re: [bitcoindev] Anyone can boost - a more efficient alternative to
anchor outputs
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On 2024-03-19 04:24, Peter Todd wrote:
> To reduce trust you could do an automated, multiple round, signing
> scheme where
> the service signs transations with higher and higher fee-rates in
> exchange for
> most funds over LN.
When the service thinks the user has paid all that they're going to pay,
what stops them from replacing their transaction one more time with a
version that does not sponsor the user's transaction? Also, what stops
the service from selling the same space in a sponsor transaction to
multiple users at once, e.g. customers Alice and Bob each iterate with
the service many times until they get a sponsor with as much fee as they
want, but when they go to broadcast, they discover that their
transactions conflict, so one of them paid for nothing?
I had thought about using a simple pay-for-signature scheme using
signature adaptors and a hoped-for LN that supports PTLCs, but I think
it suffers from the same problems. I haven't been able to think of a
way to significantly reduce trust for outsourced sponsorship without
also significantly reducing the efficiency of sponsor transactions.
-Dave
P.S. related discussion about efficient sponsors may be found in this
thread:
https://delvingbitcoin.org/t/improving-transaction-sponsor-blockspace-efficiency/696
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