Disposing of "dust attack" UTXOs

Implementation
32

For those of you following along at home, some big new developments on this project.

  • The bitcoin/bips editors have assigned BIP 451 to our proposed “Dust UTXO Disposal Protocol”
  • @harris and I have updated the reference ddust tool to implement the revised BIP 451 spec. Notable changes include:
    • All disposal transactions now use the same OP_RETURN “ash”output; transactions are slightly larger but have more opportunities to be batched
    • Batching logic accurately follows RBF calculations for bitcoin core 31.0 cluster mempool
    • By default (but optional) dust UTXOs will only be dispose of if there are no non-dust UTXOs using the same address; prevents prematurely revealing the address public key
    • Tested with bitcoin core 31.0 and -privatebroadcast; improves privacy

See all the PRs details.

We’re still looking for feedback on the draft BIP if anyone has any new suggestions.

A big thanks to everyone in this thread, the current spec is vastly better because of your constructive input.

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