Subject: Re: [bitcoindev] Redefine packages to discourage address reuse

From: Peter Todd <[email-masked]>
Date: Wed, 23 Oct 2024 10:35:52 -0400

On Sat, Oct 19, 2024 at 11:19:15PM -0700, /dev /fd0 wrote:
> Hi Bitcoin Developers,
> 
> Address re-use is bad for privacy and such transactions affect everyone 
> involved. A mempool policy to reject such transactions will be useless, 
> however packages could be redefined to avoid address re-use in package 
> transactions.
> 
> BIP 331 defines packages as a list of unconfirmed transactions, 
> representable by a connected Directed Acyclic Graph (a directed edge exists 
> between a transaction that spends the output of another transaction). With 
> the new definition, transactions with address reuse cannot be a part of 
> package relayed by nodes with SENDPACKAGES P2P message.

This kind of idea has been proposed multiple times and rejected.

In this particular case, an especially bad problem with it is there are
probably L2 protocols that actually need to reuse addresses in certain
circumstances. There are likely to also be situations where an adversary
can trigger unintentional address reuse, and thus get transactions
pinned by this filter.

For these reasons alone, NACK.

-- 
https://petertodd.org 'peter'[:-1]@petertodd.org

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