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poll_once and reconcile.py's existence check both called
blockchain.transaction.get(txid, verbose=True). Several Electrum server
implementations and versions reject the verbose flag outright
("verbose transactions are currently unsupported"), which would have
meant no confirmations and no reconciliation ever running against such
a server, read as a plain transport error. reconcile.py additionally
decided whether to abandon a transaction - releasing its funds - by
substring-matching the error text ("missing", "not found", ...), which
only works against ElectrumX's specific wording.
Both now ask blockchain.scripthash.get_history for the address that
owns every input of the transaction (a user's own address for a
bet/withdrawal, the pool address for a payout) and look for the txid in
the result: present with height > 0 means confirmed, present with
height <= 0 means still in the mempool, absent means the server
doesn't know it. get_history is a plain, universally-supported Electrum
method, and "not in the list" replaces the old substring-matching
entirely - no more guessing at error wording to decide whether to
release funds. History is cached per scripthash within one pass, since
every "payout" row shares the same pool address.
New app/tx/pending_address.py factors out own_address_for (the
address derivation was previously duplicated informally inside
tx/broadcast.py's signing context) so confirmation.py and reconcile.py
share one definition instead of two that could compute different
addresses for the same row.
tests/unit/test_confirmation.py and test_reconcile.py needed real User
rows and a master-key bootstrap they didn't have before, since address
derivation is now exercised for real rather than assumed. Suite grows
from 217 to 222 tests. BUGS.md moves B-41 to Previously fixed - no
Medium-severity finding remains open.
114 lines
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114 lines
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Markdown
# Known bugs
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A second full-codebase audit on 2026-07-27 found **25 further issues** (4 critical, 6 high,
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7 medium, 8 low), listed below as B-42 … B-49. B-25 through B-41 are fixed (see "Previously
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fixed" below) — no Critical- or Medium-severity finding remains open; the other 8 are Low/hygiene.
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The 139-test suite was green at the time of the audit, so none of these were caught by existing
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coverage — every fix lands with a regression test (the seventeen fixes so far brought the suite
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from 139 to 222).
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The recurring pattern across the open findings is worth stating once: the code is rigorous
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about the failure modes that have actually been hit, and silent about the ones that have not.
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The payout phase is now fully recoverable; the "drawing" phase (waiting on a block) is now
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observable (B-36) but still has no equivalent resume-after-restart — see "Known gaps / TODO"
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in [CLAUDE.md](CLAUDE.md), which is also where other by-design limitations (single-shared-token
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admin auth, single-process assumptions, no user-facing history, etc.) are documented.
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---
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## Low / hygiene
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### B-42 — `/docs` exposed in production
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FastAPI mounts Swagger by default, so the entire API surface — `/admin` included — is publicly
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enumerable. The README advertises it.
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**Fix:** `docs_url=None, redoc_url=None, openapi_url=None` in production (env-gated), or place
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them behind `require_admin`.
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### B-43 — No HTTP security headers
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The [Caddyfile](Caddyfile) sets no CSP, no `X-Frame-Options`/`frame-ancestors`, and no HSTS
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(Caddy does not add it on its own). The JWT lives in `localStorage`, so any XSS exfiltrates
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it, and the page is iframeable.
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**Fix:** a `header` block in the Caddyfile with `Strict-Transport-Security`,
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`X-Content-Type-Options: nosniff`, `Referrer-Policy` and a CSP tight enough for two static
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pages with no external assets (`default-src 'self'`).
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### B-44 — README and CLAUDE.md contradict each other
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The README says to run `uvicorn --reload` directly and
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`docker compose run --rm app python scripts/generate_master_key.py`; CLAUDE.md says explicitly
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that neither is supported. Whoever opens the repo reads the README first.
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**Fix:** align the README's Quick start with the Docker-only workflow documented in
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CLAUDE.md and `docs/setup.md`.
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### B-45 — Unvalidated and unpaginated admin list endpoints
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`limit: int = 50` on `/admin/rounds` and `/admin/audit-log` has no bounds (`-1` means
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"everything" on SQLite), and `/admin/pending-transactions` has no limit at all — it grows
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without end.
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**Fix:** `Query(default=50, ge=1, le=500)` on both, and the same treatment plus a status filter
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on the pending-transaction list.
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### B-46 — `secrets.compare_digest` on a `str` raises on non-ASCII input
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`api/routes/admin.py:27` raises `TypeError` — a 500 instead of a 403 — when the header contains
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non-ASCII characters.
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**Fix:** compare the UTF-8 encoded bytes of both sides.
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### B-47 — Unbounded `String` columns for large text
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`raw_tx_hex` (`db/models.py:146`) and `payload_json` (`:178`) should be `Text`. It works on
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SQLite and PostgreSQL and breaks elsewhere.
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**Fix:** switch both to `Text` in a migration.
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### B-48 — No cap on input count in `select_utxos`
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A user with hundreds of small UTXOs builds a huge transaction whose fee — deducted from the bet
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amount — materially erodes their contribution to the pool, and it can exceed standardness
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limits.
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**Fix:** cap the selected inputs (e.g. 50) and fail with a translatable error suggesting a
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consolidation, or consolidate the address automatically when the count crosses a threshold.
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### B-49 — Rollback paths do not publish an SSE update
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`bets/service.py:_release_failed_bet` and `withdrawals/service.py:_release_failed_withdrawal`
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restore the balance without calling `broadcaster.publish()`, so dashboards only find out on
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their next poll.
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**Fix:** one `broadcaster.publish()` at the end of each, as every other state-changing path
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already does.
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---
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## Previously fixed
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- **B-25** — the payout had no two-phase write, unlike bets and withdrawals
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- **B-26** — a payout failure or a process restart could wedge a round in `paying_out` forever
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- **B-27** — an RBF bump reset the reconciler's own abandon clock, so a repeatedly-bumped tx was never abandoned
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- **B-28** — a hostile Electrum server (or a MITM) could single-handedly pick the round's winner
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- **B-29** — a UTXO absent from one server's `listunspent` was marked spent immediately, irreversibly, on a single unauthenticated reply
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- **B-30** — a lost scripthash subscription meant a user's deposits were never credited, with no periodic safety net
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- **B-31** — resubscribing on reconnect ran serially before anything else started, freezing the chain tip (and so an in-flight draw) for the whole sweep
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- **B-32** — an RBF bump could retry forever below BIP125's relay-mandated minimum fee delta, with no ceiling on the fee rate either
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- **B-33** — `POST /auth/login` had no rate limiting, so a password could be brute-forced against an enumerable username list
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- **B-34** — password change/reset didn't invalidate already-issued JWTs, so a stolen token survived a change meant to lock it out
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- **B-35** — API timestamps round-tripped as naive datetimes, so the frontend parsed them as local time instead of UTC
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- **B-36** — a stalled draw wait had no timeout, no log, and no audit trail, so a frozen round showed nothing in `/admin`
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- **B-37** — a withdrawal covered by unconfirmed change answered "insufficient balance" instead of distinguishing it from actually having no funds
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- **B-38** — the SSE subscriber cap was global, so one client opening enough connections degraded every other user to polling
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- **B-39** — SQLite ran without WAL or a `busy_timeout`, so a writer could block every reader and a second writer failed immediately instead of waiting
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- **B-40** — `bump_fee` held a DB session open across N slow network calls, and computed a prevout's value from a server-reported float instead of an exact integer
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- **B-41** — confirmation/reconciliation depended on a verbose `blockchain.transaction.get` reply many Electrum servers reject, and abandonment relied on fragile substring-matching of an error message
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See git history for the fix-by-fix breakdown (commits `f13f685`, `50a43ae`, `933760e`, and the
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B-28/B-29/B-30/B-31/B-32/B-33/B-34/B-35/B-36/B-37/B-38/B-39/B-40/B-41 fixes). Suite grew from 139 to 222 tests over the seventeen.
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A full-codebase audit on 2026-07-26 (commit `d4e0974`) found 24 bugs across every Python
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module under `app/`, both static frontends, and the Docker/Caddy deployment — 5 critical,
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7 high, 7 medium, 5 low. All 24 were fixed and verified against the current code on
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2026-07-27; the fixes are covered by the regression suite (grew from 79 to 139 tests) and
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five of them were additionally confirmed against a real mainnet deployment (see git history
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between `fb734bb` (documenting the findings) and `845ba98` (recording the audit outcome) for
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the fix-by-fix breakdown — each commit message names the bugs it closes and where their
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tests live).
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