`used` balance should be shown on overview page

[achow101]

Please describe the feature you'd like to see added.

A wallet with the avoid_reuse flag has an additional balances field named used. This is available through getbalances. It should also be shown on the overview page with the other balances.

Is your feature related to a problem, if so please describe it.

No response

Describe the solution you'd like

No response

Describe any alternatives you've considered

No response

Please leave any additional context

No response

[BrandonOdiwuor]

Created two PRs on this issue:

• Part one (should be merged first): Wallet: Functions to enable adding used balance to GUI overview page bitcoin/bitcoin#28776
• Part two: Add used balance to overview page #775

[hebasto]

Cross-posting @luke-jr's comment from #775:

What is the use case here? (And the avoid_reuse flag in general...)

[katesalazar]

@luke-jr I don't remember which post to quote or link, the idea was:

Algorithm to deal with forced address reuse attack utxos:

• If the unlock script has not ever been revealed:
  • All attack utxos are to be spent together with the non-attack utxos in the spending event.
• If the unlock script has already been revelead:
  • All attack utxos are to be ignored forever.

For this algorithm makes sense to have a configuration in order to allow the wallet operator to ignore reused addresses.

I guess one could alternatively have a companion script for checking reused addresses and burn the attacking utxos or spend them in a controlled way, but if the node doesn't ignore them, there'd be always a minimum risk that the funds are used before any observing operator or script gets to spend or burn them.

Hope that helped.