# Belief Index Data – Point-in-Time Snapshot 2026-07-09

Rules-based indices of market-implied event probabilities, computed from
prediction market data and recorded live at each ~30-minute valuation window
since inception. This bundle is a dated, immutable snapshot: as-published
values are never restated, and every snapshot remains permanently available
at https://beliefsystems.xyz/data

## Contents

- `belief-index-series.csv` – series reference (full universe, incl. resolved/terminated; mirror pairs flagged)
- `belief-index-levels_{TICKER}.csv` – index levels per valuation window
- `belief-index-compositions_{TICKER}.csv` – basket membership + target weights per composition version
- `belief-index-reconstitutions_{TICKER}.csv` – reconstitution events with chain-linking arithmetic
- `DATA-DICTIONARY.md` – full field definitions and semantics (read this first)
- `LICENSE.md` – CC BY-NC 4.0 + editorial-use grant, attribution required
- `CITATION.cff` – citation metadata
- `manifest.json` – row counts, coverage, SHA-256 checksums

## Quickstart

```python
import pandas as pd

levels = pd.read_csv(
    "belief-index-levels_PEACE.csv",
    parse_dates=["timestamp_utc"],
    dtype={"raw_nav": str, "index_level": str},
)
levels["index_level"] = levels["index_level"].astype(float)
levels.set_index("timestamp_utc")["index_level"].plot()
```

Join levels to their basket composition:

```python
comps = pd.read_csv("belief-index-compositions_PEACE.csv")
levels.merge(comps, on="composition_version", how="left")
```

## Verify integrity

Every file's SHA-256 (including this bundle's) is published in
`manifest.json`, which sits alongside the bundle at
https://beliefsystems.xyz/data/archive/2026-07-09/manifest.json –
it cannot live inside the zip because it records the zip's own checksum:

```sh
shasum -a 256 belief-index-levels_PEACE.csv
```

## Citation

> Belief Systems. Belief Index Data, snapshot 2026-07-09.
> Retrieved from https://beliefsystems.xyz/data (archive/2026-07-09).

Machine-readable citation metadata is in `CITATION.cff`.

## More

- Methodology: https://docs.beliefsystems.xyz/indices/nav-methodology
- Benchmark governance (versioning, corrections): https://docs.beliefsystems.xyz/trust/benchmark-governance
- Academic research program (deeper extracts on request): https://beliefsystems.xyz/research
- Questions: research@beliefsystems.xyz