# Time Anchor Trust Roots (draft) — for AIRGAP-TIME-57-001

Provides a minimal, deterministic format for distributing trust roots used to validate time tokens (Roughtime and RFC3161) in sealed/offline environments.

## Artefacts
- JSON schema: `docs/airgap/time-anchor-schema.json`
- Trust roots bundle (draft): `docs/airgap/time-anchor-trust-roots.json`

## Bundle format (`time-anchor-trust-roots.json`)
```json
{
  "version": 1,
  "roughtime": [
    {
      "name": "stellaops-test-roughtime",
      "publicKeyBase64": "BASE64_ED25519_PUBLIC_KEY",
      "validFrom": "2025-01-01T00:00:00Z",
      "validTo": "2026-01-01T00:00:00Z"
    }
  ],
  "rfc3161": [
    {
      "name": "stellaops-test-tsa",
      "certificatePem": "-----BEGIN CERTIFICATE-----...-----END CERTIFICATE-----",
      "validFrom": "2025-01-01T00:00:00Z",
      "validTo": "2026-01-01T00:00:00Z",
      "fingerprintSha256": "HEX_SHA256"
    }
  ]
}
```
- All times are UTC ISO-8601.
- Fields are deterministic; no optional properties other than multiple entries per list.
- Consumers must reject expired roots and enforce matching token format (Roughtime vs RFC3161).

## Usage guidance
- Ship the bundle with the air-gapped deployment alongside the time-anchor schema.
- Configure AirGap Time service to load roots from a sealed path; do not fetch over network.
- Rotate by bumping `version`, adding new entries, and setting `validFrom/validTo`; keep prior roots until all deployments roll.

## Next steps
- Replace placeholder values with production Roughtime public keys and TSA certificates once issued by Security.
- Add regression tests in `StellaOps.AirGap.Time.Tests` that load this bundle and validate sample tokens once real roots are present.
- CI/Dev unblock: you can test end-to-end with a throwaway root by:
  1. Generate Ed25519 key for Roughtime: `openssl genpkey -algorithm Ed25519 -out rtime-dev.pem && openssl pkey -in rtime-dev.pem -pubout -out rtime-dev.pub`.
  2. Base64-encode the public key (`base64 -w0 rtime-dev.pub`) and place into `publicKeyBase64`; set validity to a short window.
  3. Point `AirGap:TrustRootFile` at your edited bundle and set `AirGap:AllowUntrustedAnchors=true` only in dev.
  4. Run `scripts/mirror/verify_thin_bundle.py --time-root docs/airgap/time-anchor-trust-roots.json` to ensure bundle is parsable.