Privacy warning before sending to used address

[MaxHillebrand]

Problem

currently there is no warning BEFORE the user sends a transaction to an address that is already used. There is no prevention of this bad privacy practice.

Solution

Every time an address is pasted into the field that is already used, throw a warning message that this is bad for privacy.

Not sure how this would work technically, especially for address reuse on the entire timechain, since there is no index of addresses... Maybe it works easier only for addresses that this wallet has previously send to, then only the tx history needs to be indexed, and this is how most users will make this mistake anyhow.

[benthecarman]

Wouldn't be possible to do with all addresses, definitely possible to do with addresses in our history and our own addresses

[MaxHillebrand]

Yes, and the latter is the more common issue, I would presume.

[BTCparadigm]

Warning message would be useful IMHO.
"Reusing addresses is bad for your privacy, do you still want to continue?"
with Y/N options and a small blue "More info" as a link to docs.wasabiwallet.io page about address reusing?