coinosv3.git/src/qr.js, branch master

Three render hogs put on a leash for the sluggish-tabs hunt: qrSvg is memoized (make() runs eight mask trials over a version-20 grid — 30ms+ per call on a phone, paid on EVERY render of the receive pane), the header's unread count reuses its answer behind a revision counter bumped only when messages or read-marks actually change, and ark's history list rebuilds at most every 1.5s instead of per repaint

2026-09-02T20:42:24Z

Co-Authored-By: Claude Fable 5 Claude-Session: https://claude.ai/code/session_01MrkLsNScXe9b6BviUSdmMr

Compact gift links: base32 codec + uppercase /g/ path for a smaller QR

2026-06-25T23:50:21Z

Gift links now carry a compact binary encoding of just the claim-essential data (presigned inputs + the committed change output) instead of a full PSBT (~25% fewer bytes), base32-encoded and served at an uppercase /g/

 path. The QR
renders the uppercase URL in the QR alphanumeric mode (5.5 bits/char vs byte
mode's 8), so the grid drops from ~73 to ~53 modules — much easier to scan.

- wallet: _encodeCompactGift/_decodeCompactGift + _giftTx dispatcher; legacy
  base64url-PSBT links still claim (auto-detected by a magic byte). Verified
  round-trip + claim-byte-identical across 1/2/3-input and whole-balance gifts,
  against the real exported preview/claim/outpoint functions.
- app: giftUrl uses /g/; opener parses /g/ (and legacy #gift=); QR uses
  uppercase + Alphanumeric mode (qrSvg gains a mode option w/ byte fallback).
- nginx already SPA-routes /g/*; the SW serves the shell for the new path.

Co-Authored-By: Claude Opus 4.8 (1M context)



Gift QR: use error-correction level L for a less dense, easier-to-scan grid
2026-06-25T23:09:38Z
Co-Authored-By: Claude Opus 4.8 (1M context) 


Rebuild as single-file offline BIP84 wallet
2026-06-15T06:01:03Z
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)