fix(toolkit): propagate DustWallet spend state update [PM-20016]#877
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fix(toolkit): propagate DustWallet spend state update [PM-20016]#877
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justinfrevert
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ozgb
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Initial changeset for fix/PM-20016. Implementation to follow after planning phase completion. Made-with: Cursor
Initial changeset for fix/PM-20016. Implementation to follow after planning phase completion. Made-with: Cursor
Modify speculative_spend to return the updated DustLocalState alongside spends, and extend mark_spent to accept and assign the updated state to self.dust_local_state atomically with nullifier recording. Update gather_dust_spends and confirm_dust_spends in transaction.rs to thread per-wallet updated states from speculation through to commit. This ensures DustLocalState::spend's pending_until flags are propagated, preventing utxos() from returning already-spent outputs in consecutive spend operations. Addresses Least Authority audit finding Issue AO. Made-with: Cursor
Made-with: Cursor
Made-with: Cursor
Made-with: Cursor
Made-with: Cursor
…lexity lint Made-with: Cursor
Made-with: Cursor
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Summary
Fix
DustWallet::speculative_spendto return the updatedDustLocalStatealongside spends, and extendmark_spentto commit the state atomically with nullifier recording. Prevents stale-state bugs where consecutive spends select already-spent outputs. This is Least Authority audit finding Issue AO (Medium impact / Low severity, pp. 56-57).🎫 Ticket 📐 Engineering
Motivation
DustWallet::speculative_spendclonesdust_local_state, appliesDustLocalState::spenditeratively (which setspending_untilon spent UTXOs to exclude them from futureutxos()calls), then discards the updated state. The companionmark_spentmethod records nullifiers inspent_utxosbut does not apply the state changes fromDustLocalState::spend.This means consecutive transaction constructions operate on stale state — spent UTXOs remain selectable, balances are overreported, and the ledger may reject transactions due to nullifier reuse. The issue persists until event replay rebuilds state from on-chain data.
Changes
wallet/dust.rs—speculative_spend— Return type changed fromResult<Vec<DustSpend>>toResult<(Vec<DustSpend>, Sp<DustLocalState>)>, returning the accumulated state alongside spendswallet/dust.rs—mark_spent— Extended to acceptupdated_state: Sp<DustLocalState>and assign it toself.dust_local_statebefore recording nullifierstransaction.rs—gather_dust_spends— Collects per-wallet updated states inHashMap<WalletSeed, Sp<DustLocalState>>alongside spendstransaction.rs—confirm_dust_spends— Consumes per-wallet updated states via.remove()and passes each tomark_spent📌 Submission Checklist
🔱 Fork Strategy
🗹 TODO before merging