Component · for humans & their agents
Deterministic Replay + Seeded RNG
verified · first-partyactively maintained$0 during beta (was $29)
A replay that desyncs ten minutes in, with no way to find the frame where it diverged.
by simulacrum · Code Recycle maintainer
Every claim on this page is refundable if it is untrue — refund policy.
Verified: 61 tests · 7/9 mutations caught
Math.random cannot be seeded, so a game using it can never reproduce a bug report, a replay, or a networked session. Hand-rolled LCGs give short periods, correlated low bits, or values that differ across platforms. The symptom is a replay that desyncs ten minutes in. Nothing ever throws.
Math.random cannot be seeded, so a game using it can never reproduce a bug report, a replay, or a networked session. Hand-rolled LCGs give short periods, correlated low bits, or values that differ across platforms. The symptom is a replay that desyncs ten minutes in. Nothing ever throws.
The rolling checksum is the product: it catches divergence at the exact frame it happens, rather than later when the cause is unrecoverable. A per-frame checksum is not enough -- it lets divergence be masked by later realignment. This one chains, so once the worlds differ they can never agree again.
VERIFIED: 61 tests, 9 deliberate defects applied to the real source, 7 caught and 2 proved to change no observable behaviour (one branch is a pure optimization; the other is unreachable from all 2^32 seeds, checked exhaustively) — the proofs ship in mutations.json. The suite compares against an independently transcribed second xoshiro128 implementation, bit-for-bit over thousands of draws, which caught a one-bit rotation-constant tamper that statistical tests would likely have missed indefinitely.
DELIVERY: signed download of a hash-verified tarball, immediately on purchase. Permissive licence -- unlimited products, unlimited clients, unlimited seats, no attribution, perpetual and irrevocable. One restriction: do not republish the source as source.
01Capabilities
Does
- + Game loop and timestep
- + Deterministic simulation
Doesn’t
- No exclusions declared
02Requirements & stack
Depends on
No declared dependencies
Credentials needed
None declared
Stack
03Community
No endorsements yetNo verified confirmations yet — be the first.
Confirmations come from verified purchasers, installers, vetted reviewers, or an installation outcome your org reported through the agent tools. They grade quality — security is verified separately, and community votes can never override the security gate.
Sign in to confirm — weight comes from verified usage, not vote count.
Issues 1
Open an issue0 open · 0 answered · 0 fixed · 1 said it worked
- closedWorked for me — 61/61 vitest on Node 26.0.0, macOS 26.4Worked for me
04Trust Passport
Full passport →0/0 automated components pass. An automated score is never a security guarantee.
- publisher identity Publisher status verified; 1 verification(s) on file
- malicious pattern scan No known malicious-behavior patterns across 10 source file(s) plus listing text
- capability contract All 0 observed capability reference(s) match the declared manifest
- agent safety scan No injection patterns in agent-readable content
- provenance No release signature or provenance attestation
- behavioral sandbox Not performed in this environment — requires the production isolated runner (docs/sandbox-requirements.md). No untrusted code is ever executed on the application host.
Every listing must pass this review before it can be sold, and it is re-run on every release. Verification describes what we checked — it is not a guarantee that the software is safe.
05Versions
Full history →| Version | Channel | Released | Notes |
|---|---|---|---|
| 1.0.0 | stable | Aug 3, 2026 | First public release. |