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The "CORS" errors were 429 Too Many Requests (a 429 has no CORS headers, so
the browser reports it as a CORS failure). SSL/hosting is irrelevant.
Per-request retries made it worse by multiplying load on an already
rate-limited host. Replace with:
- round-robin across two Esplora-compatible backends (mempool.space +
Blockstream), halving per-host load
- park a host on an 8s cooldown when it 429s instead of retrying it
- keep the global throttle (2 concurrent, 200ms gap)
- map Blockstream's /fee-estimates to the named fee tiers
Unit-tested rotation/cooldown; live scan of 40 addresses now completes in
~8s with no failures.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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The "CORS" errors during scan were actually mempool.space rate-limiting:
bursting ~40 address lookups gets some throttled, and throttled responses
lack the access-control-allow-origin header, which the browser reports as a
CORS failure.
- api.js: route all requests through a global throttle (max 2 concurrent,
250ms min gap between starts, ~4 req/s) with exponential backoff retry so
occasional throttles recover instead of failing. Unit-tested spacing +
retry recovery.
- Import pane: drop the "(12 or 24 words)" parenthetical (we generate 12),
and replace the scrunched ellipsis placeholder with an enumerated
word1..word12.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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Replace the SvelteKit/daisyUI prototype with a vanilla JS + hand-rolled CSS
app that Bun bundles (code + scure/noble crypto + QR + CSS) into one
self-contained dist/index.html runnable offline from file://.
Wallet core (src/wallet.js):
- BIP84 native-segwit HD wallet from BIP39 seed (+optional passphrase)
- gap-limit scan of receive/change chains, aggregate balance, tx history
- fresh receive/change addresses; signs with witnessUtxo only (enables
offline signing with no prev-tx fetch)
- coin selection + fee estimation via btc-signer selectUTXO; send-max;
manual coin control
- offline JSON snapshot export/import (keyless) + signed-tx hex/QR export
- realtime mempool.space WebSocket: track-addresses -> debounced auto
refresh of balances/history (no polling); live status badge
UI (src/app.js): clean light paper-wallet; create (with optional, skippable
backup verification) / import flow; receive (QR) / send / history / coins /
tools tabs; clickable logo returns home.
API (src/api.js): mempool.space wrapper with retry/backoff for scan-burst
rate limiting; single network choke-point for offline enforcement.
Verified: BIP84 spec vectors, build/sign/parse for auto/max/manual flows,
snapshot roundtrip, live scan + WebSocket, headless-Chrome UI smoke tests.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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