| Step | What is recorded |
|---|---|
| 1 · Prediction frozen | Quantity, extraction method, comparison rule and threshold, and the environmental envelope of validity. |
| 2 · Instruments declared | Make, model, serial number, unit and role of every channel; time-compared channels share one sample clock. |
| 3 · Calibrations bound | Measured, sealed, unexpired calibration records matching serial numbers, gain settings and inputs. Typed values are refused. |
| 4 · Environment recorded | Temperature, humidity and pressure against the envelope. Outside it the result is inconclusive; the prediction is never adjusted. |
| 5 · Intent frozen | Everything above, bound into one sealed intent before a single byte of measurement exists. |
| 6 · Captured with custody | The original recording, exactly as received, identified by its hash. Resampling audio paths and dropped samples are refused. |
| 7 · Verified | Hashes, identities and the order of events recomputed from the stored files. |
| 8 · Compared | The frozen extraction applied to measured and simulated signals alike; the frozen rule gives the verdict; the receipt is re-verified. |
The measurement chain
The order is enforced by the software: a step cannot begin until the earlier records exist and verify.