two holes found auditing the wallet sidecar after the frozen-utxo fix.
the brute-force backoff lived inside UnlockSession.unlock alone, so /unlock capped
at five guesses a minute while export-seed — the one endpoint that returns the words
in the clear — took unlimited ones. every passphrase check now goes through the same
guard. verifyPassphrase rethrows LOCKED_OUT rather than folding it into `false`, so a
caller can tell "wrong" from "stop".
nextUnused advanced its mark on every issuance, paid or not, so a run of unpaid
addresses walked it past the end of the window the next scan covers; a payment there
would never be found again, and esplora has no rescan to go looking. sources now
declare how far past a scan's last index they can still see, and issuance clamps to
it — re-offering a virgin address rather than handing out one that could lose money.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
registering an xpub only indexes it from that moment on, so an imported
seed with history read as a confident zero: every call succeeded, the
coins were simply absent. scantxoutset walks the node's current utxo set
directly and finds them regardless of when the account was registered.
runs all four script variants sequentially — the funds could be on any
one — and surfaces progress through the existing SyncState channel so
the balance says "scanning" rather than nothing. auto-fires on an
imported mnemonic only; a generated seed has no history to look for.
recovers spendable coins, not spent history.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
OnchainBackend depended on the concrete EsploraChain class, so the only wallet
it could ever have was an Esplora-backed one. The seam is now WalletChainSource,
and it is drawn at the scan rather than at the HTTP client: Esplora is
address-level and has to walk the gap limit, NBXplorer is wallet-level and has
no per-address endpoint at all, so there is nothing to share one level down.
The backend keeps the keys and the money — derivation, snapshot cache, coin
selection, PSBT construction, signing — and owns no HTTP. Which indexer answers
is a constructor argument.
Also adds the NBXplorer implementation of the seam, verified end to end against
the owner's own pruned node, and the first tests over any of this: a stub
Esplora drives a real backend through the gap-limit walk, balance summation,
UTXO mapping, transaction scoring and address issuance. Nothing covered the
scan before it was moved, which is the wrong time to have no tests.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
pastilhasandClaude Opus 5