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

From: Abubakar Ismail <[email-masked]>
Date: Sun, 20 Oct 2024 08:33:16 +0100

Hi Floppy

> however packages could be redefined to avoid address >re-use in package
transactions.

What type of redefinition are you talking about here, is this not policy
rule still.

I don't think it's good for a node to reject an incentive compatible
transaction in a package because it reuses an address. I believe miners
won't.

> The only downside that I could think of is the scanning time required to
check address reuse. Maybe others could suggest solutions for this problem
or we can limit the address reuse check only for the chain of transactions.

Other disadvantage of this is that it will affect compact block
reconstruction, nodes fee estimation.

Wouldn't it be better to encourage using other safe mitigations of address
reuse like silent payments?

Abubakar

On Sun, Oct 20, 2024, 8:01 AM /dev /fd0 <[email-masked]> 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.
>
> The only downside that I could think of is the scanning time required to
> check address reuse. Maybe others could suggest solutions for this problem
> or we can limit the address reuse check only for the chain of transactions.
>
> I am not sure if BIP author would agree with this change and a new BIP
> wont make a difference if its not implemented in bitcoin core.
>
> /dev/fd0
> floppy disk guy
>
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