Subject: [bitcoindev] Redefine packages to discourage address reuse

From: /dev /fd0 <[email-masked]>
Date: Sat, 19 Oct 2024 23:19:15 -0700 (PDT)

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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