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UI / copy:
- Footer: "made by Adam Soltys" (drop the heart) + a "How it works"
link on its own line, matching the footer's size.
- New "How it works" page: plain-language basics plus an expandable
"for the technically curious" section. Routed via ui.screen, with
Back/logo returning to wherever you opened it from.
- Scrub jargon from the main UI for newcomers: drop BIP39, soften
"raw hex" -> "code", "txid" -> "transaction ID", "air-gapped" ->
"offline"; replace em dashes in the intro/keys notes. The technical
terms now live only in the How it works technical section.
Import / scan performance (fewer requests -> fewer 429s, faster):
- Skip the /utxo fetch for fully-settled, zero-balance addresses
(they can't hold UTXOs) -- the bulk of a history-heavy wallet.
- Show balance as soon as the address scan finishes, then load UTXOs
and history in the background.
- Probe the receive and change chains concurrently so their per-hit
delays overlap.
- History fills in progressively as each address resolves, with a
loading indicator on the History tab.
i18n.js is now tracked; new English keys fall back to English for the
other languages until translated.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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WS-detected deposits now get added to history (previously the ingest advanced
past the address so the tx never entered history — balance showed but History
was empty). Pending txs render with a "⏳ pending" badge, an orange-tinted row,
and "awaiting confirmation" so they're clearly distinct from confirmed ones.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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- The "Payment received!" celebration now persists: the acknowledged fresh
index is stored (per seed) in localStorage, so a received payment keeps
showing the dialog until you tap past it, even after a refresh.
- Footer: only "GitHub" is the link now.
- README rewritten for the current state (mainnet-only, realtime, Nostr sync,
multi-recipient, sats default, explorer resilience, etc.).
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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The pending balance showed immediately from the WS ingest, but the next
receive address/QR only appeared after the debounced refreshLive. Now the WS
ingest marks the receiving address used and advances the fresh index right
away, so the new address shows in the same update as the balance.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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refreshLive escalated to a full scan() when the fresh address changed, which
re-queried every coin's /utxo and /txs. Rewrite it to walk the frontier
incrementally: advance through newly-used addresses, fetching /utxo + /txs for
only those, and never revisit already-scanned coin addresses. WS events use
the same path. A new deposit now costs ~5 requests instead of a full re-scan.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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mempool's track-addresses caps at 10 per connection; we were sending all coin
addresses + a 15-wide frontier, so the subscription was rejected and realtime
updates silently stopped. With the frontier model (coins handled by post-send
refresh + Nostr sync), only the next receive and change address need watching
— so track exactly those two.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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Persist wallet state (addresses, utxos, history, indices, fees) as a NIP-44
encrypted, parameterized-replaceable event (kind 30078) addressed to self on
relay.coinos.io. The Nostr identity is derived from the same seed (NIP-06), so
no extra secret. On load we pull the latest state from Nostr — a device with
no local cache gets full state without re-scanning, and another device's
updates propagate — using savedAt to keep the newest copy. localStorage stays
as the instant/offline cache; state is published (debounced) on every change.
(Relay note: added kind 30078 to the strfry write-policy allowlist on prod.)
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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Per request: an address is scanned once, then never auto-scanned again. The
routine poll now checks only the fresh frontier (next receive + change
address) for new deposits; coin-holding addresses are no longer polled and
the periodic full re-scan is removed. Spends on existing coins arrive via the
WebSocket while connected; a new Settings → Rescan button does a full scan to
catch anything missed (e.g. a payment to a reused old address).
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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This IP is rate-limited/banned by mempool.space, so REST + WS now go through
an nginx CORS proxy on the OVH VPS (mempool via /mp, blockstream via /bs).
Controlled by a single PROXY constant in api.js — set it to '' to revert to
the public explorers once the ban is lifted. Hosts are tagged by kind so fee
format detection still works.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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Idle polls were re-querying every used address (~N requests each cycle). Now
the background poll checks only addresses that can change — those holding
coins and the next fresh receive/change address — and escalates to a full
scan only when one of them moves. Stable historical addresses stay cached.
A full scan still runs every 5 min as a safety net. Cuts steady-state request
volume dramatically for wallets with many used addresses.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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The mempool WS sends no periodic traffic on a track-addresses-only
subscription, so a half-open connection (died without firing onclose) went
undetected and updates fell back to the slow poll. Add:
- ping every 15s ({action:'ping'} -> pong); if no message for 45s, force a
reconnect (handles half-open sockets).
- reconnect + refresh on tab refocus (visibilitychange) and network 'online'.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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The mempool.space WebSocket push already contains the transaction, so parse
it on arrival to add the incoming UTXO and bump pending immediately, instead
of waiting on a debounced re-scan. The scan still follows (400ms) to
reconcile spends/confirmations. Removes the ~3s our handler added on top of
mempool.space's own push latency.
(Measured: mempool.space itself takes ~8s to see a coinos-broadcast tx due to
p2p propagation — the real fix for incoming-payment latency is the sender
pushing directly to the explorer.)
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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429 handling: route every outgoing request (address, utxo, txs, fees,
broadcast) through one scheduler. A 429 from ANY request now pauses ALL
subsequent requests with exponential backoff (2s→30s), easing off after a
streak of successes — instead of only cooling down the same host/kind.
Fewer requests: derive balance from /address chain_stats (no /utxo needed
just to total), and on background polls fetch only /address. The heavier
/utxo + /txs are pulled only on first load or when the balance/addresses
actually change. Idle polls drop from ~3N requests to ~N.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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Max button: fill the amount field with the computed maximum (n inputs, 1
output, current fee rate) so it gives visible feedback instead of just
blanking/disabling the field.
Rate limits: eliminate look-ahead (gap limit 1 — stop at the first unused
address, safe because we only ever expose one unused address at a time),
query one address at a time (API concurrency 1, 400ms spacing across two
backends), scan chains sequentially, and pause 500ms after each used address.
An empty scan is now ~2-3 requests instead of ~10+.
History cache: persist scanned state (addresses, utxos, txs, indices) in
localStorage keyed by sha256(seed) — the seed itself is never stored. Re-
importing the same seed in this browser shows the last-known balance/history
instantly while a fresh scan runs. Cleared by nothing automatically (public
chain data); different seeds get separate keys.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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- Remove the online/live status badge and the USD price line, which both
appeared after load and caused layout shift. Stop fetching price entirely.
- Persist the seed + passphrase in sessionStorage so a page refresh restores
the open wallet instead of returning to the unlock screen. Cleared on
logout and (by the browser) when the tab closes.
Note: sessionStorage holds the seed in plaintext for the tab session — an
acceptable tradeoff for this self-custody tool and scoped to the tab.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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Relying solely on the mempool WebSocket was unreliable: it only pushes new
events (no replay), and pushes can be missed (drops, server quirks), so a
deposit could go unseen with no manual refresh to fall back on.
- Add a 12s background poll alongside the WebSocket.
- Make background refreshes "silent": scan({silent:true}) re-renders only when
the visible state (utxos/txs/fresh indices) actually changes, so polls never
flash the UI or steal input focus while typing.
- Skip fees/price fetches on routine polls to keep request volume low.
- WS events now trigger the same silent refresh (debounce 800ms).
Unit-tested: silent refresh emits once when a pending deposit appears and not
at all when nothing changed.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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- Remove the unlock-screen "Offline mode" checkbox and network selector.
Always mainnet. Attempt a scan on open; if navigator is offline or the
scan fails (network unreachable), fall back to offline automatically with
a banner + Retry instead of an upfront toggle.
- Drop the manual balance "Refresh" and receive "Check for payments"
buttons; the WebSocket keeps things current.
- Update balances silently: add a wallet.loaded flag so the balance only
dims on the very first load and history/coins only show a spinner before
the first load. Background WS-driven rescans no longer flash spinners.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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Since the wallet only ever exposes one unused receive address at a time,
used addresses stay contiguous (gap never exceeds 1), so a gap limit of 5 is
a safe margin and cuts a scan from ~40 to ~10 requests.
Also reword the receive note: the address advances automatically (via the
realtime WebSocket) when paid, so drop the confusing "scan again".
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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