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fix(key-wallet): reject an account xpub another account already uses - #1321
Wallet::add_account only rejected a duplicate account type, so two accounts could share an xpub, derive the same addresses and count the same UTXOs twice in the balance.
It now rejects an account whose xpub another account already uses, whether the xpub was passed in or derived. Contact-owned accounts are exempt: a wallet holding both identities of a friendship derives the same xpub for the receiving account and the reverse external account, and the external account holds no funds, so that pair never counts a coin twice.
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key-wallet (key-wallet/src/wallet/accounts.rs, key-wallet/src/wallet/mod.rs) — approved by xdustinface
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Summary by CodeRabbit
Bug Fixes
Prevented adding an account when its extended public key duplicates one already in the wallet. Duplicate detection applies even when other key details differ, and rejected accounts do not change the wallet’s account list. This helps avoid adding multiple accounts that share the same underlying public key and chain code.
No actionable comments were generated in the recent review.
Walkthrough
Wallet::add_account now rejects an account when its xpub has the same public key and chain code as an existing account. Regression tests cover imported and derived account cases and verify that rejection leaves the account count unchanged.
Changes: Duplicate xpub validation
Layer / File(s)
Summary
Duplicate xpub check and regression tests key-wallet/src/wallet/accounts.rs, key-wallet/src/wallet/mod.rs, key-wallet/src/tests/restore_utxos_tests.rs
add_account returns Error::InvalidParameter when the new xpub matches an existing account’s public key and chain code. Tests cover xpub variants and account pairings, check that the count stays unchanged, and construct explicit account data in the restore test.
dashpay/rust-dashcore#1278: Changes FFI account-add entry points, including xpub-based functions that call the account-registration path.
Suggested reviewers:xdustinface
Merge Risk: Minimal · up to 957be
Duplicate account keys are now rejected, and no actionable merge-blocking risk is established. Merge after normal checks.
Pre-merge checks: 4
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Status
Explanation
Title check
The title clearly summarizes the main change: Wallet::add_account rejects an account when another account already uses its xpub.
Linked Issues check
Issue #1301 requires Wallet::add_account to reject an xpub already used by another account with Error::InvalidParameter and leave the account collection unchanged. `key-wallet/src/wallet/accounts.…
Out of Scope Changes check
The changes support issue #1301. The restore_utxos_tests.rs setup now inserts accounts directly so the test can retain its intentional shared-xpub fixture despite the new add_account validation. T…
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Full details: Linked Issues check
Explanation
Issue #1301 requires Wallet::add_account to reject an xpub already used by another account with Error::InvalidParameter and leave the account collection unchanged. key-wallet/src/wallet/accounts.rs compares the candidate account's public key and chain code with existing accounts before insertion. Tests in key-wallet/src/wallet/mod.rs cover supplied and derived duplicate xpubs and verify the error and unchanged account count.
Full details: Out of Scope Changes check
Explanation
The changes support issue #1301. The restore_utxos_tests.rs setup now inserts accounts directly so the test can retain its intentional shared-xpub fixture despite the new add_account validation. The other changes implement validation and regression coverage.
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Reviewing files that changed from the base of the PR and between c7bb2ce and 957be3b.
Files selected for processing: 3
key-wallet/src/tests/restore_utxos_tests.rs
key-wallet/src/wallet/accounts.rs
key-wallet/src/wallet/mod.rs
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Unverified finding
Verification ran but could not confirm this finding. It is shown for review, not as a verified issue.
Use a fixed seed in both regression tests.
Wallet::new_random generates a new mnemonic for each run. Use a fixed seed or known mnemonic so a failed xpub regression has a reproducible fixture. (raw.githubusercontent.com) As per coding guidelines, “Deterministic Testing: Use known test vectors with fixed seeds.”
Also applies to: 596-596
Source: Coding guidelines
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @key-wallet/src/wallet/accounts.rs:
- Line 65: Update the duplicate check in Wallet::add_account to compare each
account’s xpub derivation key—public_key and chain_code—instead of full
ExtendedPubKey equality. Keep network compatibility validation separate from
duplicate detection.
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Reviewing files that changed from the base of the PR and between a319c0a and 672276e.
Files selected for processing: 2
key-wallet/src/wallet/accounts.rs
key-wallet/src/wallet/mod.rs
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✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.79%. Comparing base (c7bb2ce) to head (517ae39). ⚠️ Report is 22 commits behind head on dev.
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Why did you remove the two restore_utxos tests? I think the overlapping pair can still happen: Platform rebuilds accounts on load with AccountCollection::insert, and since it stores the contact account before calling add_account, a refused account comes back on the next load. With the tests gone, putting dashpay_external_accounts first in funds_accounts_wallet_first keeps all 792 key-wallet tests green.
Both tests broke only because befriend_both_ways adds the accounts with add_account, which now refuses the second one. If that helper inserts them with ctx.wallet.accounts.insert(...) instead, both tests pass on your branch without any other change:
let path = contact.derivation_path(ctx.wallet.network).expect("contact path");let xpub = ctx.wallet.derive_extended_public_key(&path).expect("contact xpub");let account = Account::new(Some(ctx.wallet.wallet_id), contact, xpub, ctx.wallet.network).expect("contact account");
ctx.wallet.accounts.insert(account).expect("contact account is insertable");
The pair of DashPay accounts sharing an xpub is still reachable through `AccountCollection::insert`, so the `restore_utxos` tests that cover it insert the accounts directly instead of through `add_account`.
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Restored both tests, with befriend_both_ways inserting the accounts through accounts.insert.
But if the pair is still reachable through AccountCollection::insert, the check in add_account loses its point: it guards one path out of two. I'd rather have a single path. We could make AccountCollection::insertpub(crate) so add_account is the only way in, and have Platform's build_wallet start from an empty collection and call add_account(account_type, Some(xpub)) for each persisted row. Platform would also have to decide what loading does with a wallet that already persisted a duplicate pair: skip the row or migrate it away.
If that isn't possible, it's almost better to close this PR and accept that two accounts can share an xpub, but then #1301 stays open: the same UTXOs would still count twice in the balance unless we handle that elsewhere.
Team: Claude Sonnet 5.5 · high, Claude Opus 5.5 · high
Memory: enabled (central)
Account limits:
Claude subscription: weekly 46% (resets 2026-11-17 05:00 UTC)
Judge decisions:
Kept: "Accounts that reach the wallet through AccountCollection still skip the duplicate-xpub check" (suggestion, medium confidence): "suggestion. The cited code bears out the claim. AccountCollection::insert (account_collection.rs:110) matches only on account_type. new_watch_only and new_external_signable (initialization.rs:178, 201) store a host-built collection unchecked. This PR does not touch or change those paths, so duplicates through them were already possible before it. Issue add_account accepts an xpub another account uses #1301 scopes the fix to add_account. Moving the check into insert would follow the repository's root-cause rule, but leaving it out adds no new defect, so this is an improvement to discuss rather than a regression."
Kept: "Adding a DashPay contact whose identity is in the same wallet now fails" (warning, medium confidence): "warning. Before this PR, befriend_both_ways added both contact accounts with ctx.wallet.add_account(contact, None). The PR replaces that with a direct ctx.wallet.accounts.insert (restore_utxos_tests.rs:61-65), because the derived reverse-external xpub equals the receiving account's xpub and the new check at accounts.rs:65-74 now rejects it. Hosts calling WalletManager::create_account (key-wallet-manager/src/lib.rs:692) for that contact get AccountCreation errors, and the # Errors doc does not mention the new rejection. The rejection appears deliberate, since it is how the PR stops the double count. Even so, it breaks a flow the restore ordering was built for. Those restore tests now cover a state the public API can no longer produce, which goes against the repository rule to test through the public API. A consumer that adds same-wallet contacts breaks once it upgrades. No consumer call site is shown here, so this is not a blocker."
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✅ Approved. 1 warning and 1 suggestion, none of which block.
What this does: Adding an account to a wallet could reuse the same extended public key as an existing account, so both accounts watched the same addresses and could count the same coins twice. add_account now refuses an account whose key and chain code are already used by another account.
Related work: open PRs and issues that may cover the same change. None of them blocks.
The review model wrote these steps. Check what a step runs before you follow it.
Setup: Create a testnet wallet with default accounts, for example with Wallet::new_random.
Call add_account for a new BIP32Account at index 5, passing the xpub of BIP44 account 0. Expect Error::InvalidParameter and an unchanged account count.
Repeat with that xpub's depth, parent_fingerprint or child_number changed. Expect the same rejection.
Import the derived BIP44 index 5 xpub as a BIP32Account at index 5, then call add_account for BIP44 index 5 with None. Expect Error::InvalidParameter.
Add a DashpayReceivingFunds account for identities A to B, then a DashpayExternalAccount for B to A with None. Expect Error::InvalidParameter.
Add BIP44 account 1 and CoinJoin account 2 with None. Expect both to succeed, since their keys differ.
Edge case: add an account type that already exists. Expect the existing "already exists" error, not the shared-xpub one.
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Code
The pair the restored tests cover doesn't double count, so it isn't the #1301 bug. update_balance sums only all_funding_accounts, and that list leaves out dashpay_external_accounts. With the receiving and reverse contact accounts both holding a 29,000 coin at their shared address, balance.total() is 29,000. The pair that double counts is two balance-counting accounts on one xpub, such as BIP44 #0 and BIP32 #0, and add_account is the right place to refuse it.
Making AccountCollection::insertpub(crate) wouldn't make add_account the only way in. Wallet.accounts and every map inside it are pub, and a deserialized Wallet never goes through add_account. The balance is also summed on the managed side, which add_managed_account_from_xpub and insert_funds_bearing_account fill without it. So leave insert and Platform's loaders as they are.
The check refuses the harmless pair, and that breaks Platform for a wallet holding both identities of a friendship.
Platform stores the account row before it calls add_account. A refused account then stays missing in memory and fails again on every sweep until the app relaunches. Whichever account arrives second is the one that fails. If it is the external account, send_payment to that friend fails. If it is the receiving account, that friend's payments aren't seen. Skip contact-owned accounts on both sides with the existing AccountType::is_contact_owned:
Then change test_add_account_rejects_reverse_external_sharing_receiving_xpub to assert that the pair is accepted. Put befriend_both_ways back on ctx.wallet.add_account(contact, None). With those changes all 794 key-wallet lib tests pass, and every rejection case in test_add_account_rejects_imported_xpub_in_use and test_add_account_rejects_derived_xpub_in_use still fails as intended.
A wallet holding both identities of a friendship derives the same xpub for the receiving account and the reverse external account. The external account holds no funds, so the pair never counts a coin twice. Skip contact-owned accounts in the duplicate xpub check of `add_account`.
Team: Claude Sonnet 5.5 · high, Claude Opus 5.5 · high
Memory: enabled (central)
Account limits:
Claude subscription: weekly 48% (resets 2026-11-17 05:00 UTC)
Judge decisions:
Kept: "Wallets built from a caller-supplied AccountCollection skip the new duplicate xpub check" (suggestion, high confidence): "suggestion, kept at the round-one grade of P1. This round only exempted contact-owned accounts at key-wallet/src/wallet/accounts.rs:66-68. It did not move the check, so there is no new evidence. The claim holds: AccountCollection::insert at key-wallet/src/account/account_collection.rs:110 stores accounts by type alone. new_watch_only and new_external_signable at key-wallet/src/wallet/initialization.rs:178 and :201 store the collection as given. add_managed_account_from_xpub at managed_accounts.rs:107-115 checks only the type. These paths existed before this PR and still behave as before. This is a gap in how far the fix reaches, not a defect the PR adds."
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✅ Approved.
What this does: A wallet could hold two accounts built on the same extended public key, so both tracked the same addresses and funds. Adding an account now fails with InvalidParameter when its key is already used by another non-DashPay account in the wallet.
Related work: open PRs and issues that may cover the same change. None of them blocks.
The review model wrote these steps. Check what a step runs before you follow it.
Setup: Use a key-wallet build with a fresh wallet from Wallet::new_random on testnet with WalletAccountCreationOptions::Default.
Import the xpub of BIP44 account 0 as a BIP32 account at index 5 through add_account. Expect Err(Error::InvalidParameter(_)) and an unchanged account count.
Change the xpub's depth, parent_fingerprint or child_number and import it again. Expect the same rejection.
Import the derived BIP44 index 5 xpub as a BIP32 index 5 account, then call add_account for BIP44 index 5 with None. Expect InvalidParameter.
Add a BIP44 account at index 1 with None. Expect success, since its key is new.
Add DashpayReceivingFunds for ids A and B, then DashpayExternalAccount for B and A. Expect both to succeed.
Edge case: import a DashPay receiving account's xpub as a BIP32 account. Expect success, since existing contact-owned accounts are skipped by the check.
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Wallet::add_accountonly rejected a duplicate account type, so two accounts could share an xpub, derive the same addresses and count the same UTXOs twice in the balance.It now rejects an account whose xpub another account already uses, whether the xpub was passed in or derived. Contact-owned accounts are exempt: a wallet holding both identities of a friendship derives the same xpub for the receiving account and the reverse external account, and the external account holds no funds, so that pair never counts a coin twice.
Closes #1301
PR Hygiene ·
517ae39/self-reviewedkey-wallet(key-wallet/src/wallet/accounts.rs,key-wallet/src/wallet/mod.rs) — approved by xdustinfaceWhen every merge requirement is met, the
PR Hygienecheck passes. Reviewer limits do not block merging; other required GitHub checks and protections still apply.Summary by CodeRabbit