# Data

This repository does not track raw market data (see `.gitignore`). Large
binaries don't belong in a public git repo, and Binance's public API makes
the data trivially reconstructible.

## BTCUSDT 1-minute OHLCV

Used in experiments 2 and 3 (baseline and honest replication against real
data). To obtain it:

1. If `download_data.py` exists in this directory, run it — it pulls the
   exact date range used in the original experiment from the public Binance
   API and writes `BTCUSDT_1m.parquet`.
2. Verify the SHA-256 hash of the resulting file matches the one recorded in
   `audit/input/MANIFEST.md` (forensic record of the original dataset used
   when the bug was found).

```bash
sha256sum BTCUSDT_1m.parquet
```

If the hash doesn't match, the date range or Binance API response has
drifted — do not proceed with replication until it's reconciled.

## Synthetic GBM data (noise harness)

Generated on the fly by `experiments/01_generate_gbm.py`. No download
needed — this is the point of using synthetic null data: it requires zero
external dependency and is perfectly reproducible from a seed.