Deterministic replay

The same input gives the same run, and CI checks it.

Run digest

Every event is published on the bus with a delivery log; the run digest is the digest of that log. Two runs on the same input give the same digest.

Recorded digests

Checked in CI

Every pull request rebuilds both examples on Linux and Windows and fails if either digest changes. A backtest read from the data catalog gives the same digest as the same data in memory.

Live sessions

The design allows a live session's inputs to be recorded and replayed through the same path. A recorder is planned and not built.

Not tamper evidence

The digest is FNV-1a, 64 bits. It detects drift between runs, not deliberate tampering. Tamper detection for stored data is the catalog's SHA-256 manifest.