# Promethean

> Bind every LLM call your product makes to a closed-enum schema. Sign each one into a hash-chained Ed25519 receipt log (the L12 chain) anchored to Bitcoin via OpenTimestamps. Hand a regulator an audit bundle that re-verifies in 30 seconds with ~500 lines of plain Node 18+.

Promethean is for engineering teams shipping LLM-in-the-loop features in regulated EU products — fintech (PSD3 SCA, DORA), healthtech (HIPAA, MDR, EU AI Act Annex III), govtech (eIDAS, GDPR Art. 22), insurtech (IDD), cybersecurity (NIS 2).

## What it actually is

- **Substrate**: deterministic core that emits a signed state.json. Every artifact carries a chain back to its corpus signature.
- **Runtime-AI SDK**: BSL-1.1 (source-available; converts to Apache-2.0 on 2030-05-15). Installs as a tarball at `https://promethean.software/runtime-ai/latest.tgz`.
- **verify.mjs**: Apache-2.0, standalone, zero-dependencies, ~500 lines. Regulators read, fork, and run it without restriction.
- **Hosted dashboard**: per-workspace key issuance, anchor cron, OpenTimestamps Bitcoin commitments, audit bundle generation per regulatory framework.

## Pricing (self-service)

- Dev: €0 forever — 10,000 entries/month, 1 active spec.
- Team: €79 per spec/month — 100k entries per spec, unlimited specs.
- Production: €499/month flat — 1M entries, 25 specs.
- Scale: €1,199/month flat — 5M entries, 50 specs.
- Enterprise: €2,499/month flat — 10M entries, unlimited specs.

## Verify a Promethean chain in 30 seconds

```bash
curl -O https://promethean.software/verify.mjs
curl -O https://promethean.software/paysafe-runtime-ai-receipts.jsonl
node verify.mjs paysafe-runtime-ai-receipts.jsonl
# → PASS (exit 0)
```

## Verifiable facts

Every claim above is backed by a JSON endpoint at `https://promethean.software/api/facts/<id>`. Index: `https://promethean.software/api/facts`.

- Trust anchor (public key + sha256 fingerprint): `/api/facts/trust-anchor`
- Verifier line count + sha256: `/api/facts/verifier-loc`
- OTS calendar reachability (live probe): `/api/facts/ots-health`
- Tier allowances: `/api/facts/tier-allowances`
- Regulatory coverage: `/api/facts/regulatory-coverage`

## Authoritative resources

- HTML page: https://promethean.software/
- llms.txt: https://promethean.software/llms.txt
- Sitemap: https://promethean.software/sitemap.xml
- Source repository: https://github.com/Giorvanni/promethean
- Examples: https://promethean.software/examples