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The EC crypto (candidate derivation + full scan) now runs in a worker, off the
main thread, so even a large mainnet scan can't jank the UI at all. The worker is
bundled separately and embedded as base64 (single-file app), spawned from a Blob
URL; it holds the keys + per-tweak cache. If workers are unavailable or the bundle
is missing, scanning falls back to the main thread (still cached + yielding).
scanSilentPayments / _scanSpItems / _scanSpMempool now go through _spHitBlocks and
_spScanItems, which dispatch to the worker (or the fallback). +27KB to index.html
for the worker's crypto bundle.
Verified via CDP: worker runs keys/candidates/scan correctly in-browser; a real
reload + mainnet scan threw 0 exceptions and the SP address renders.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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