pastilhasandClaude Opus 5 5c38236b39 split the wallet's chain reads from its signing half
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>
2026-08-03 23:50:53 +00:00
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