{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "da50f6cbf2343105702530b6ba36e976f51cdd0e3662a1fef74795336c633380",
  "signature": "hRZw3z5cPSQB/a3RsVIZ5U3W3bLa7DpCoIoGZwRkbvxHWP/NxlLF9hJEpii+EJgIApmPyicbEhyHsMqEB2NKBg==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-24T00:51:55.594Z",
  "slug": "guardrail-historic-preservation",
  "version": "0.1.0",
  "filename": "guardrail-historic-preservation-agent-plugin.zip",
  "bytes": 3598,
  "content_digest": "43b39c960371ec7969596d0cad75b39b232aaedaad6a6b794ecf7c4b5ee59e18",
  "content_signature": "Vlccomu1zQKfGIf6n8eDmtrvoSyPu/Y+FAMrIhDxCYqIbIw4bmFZ/Oz1oyyq52owK9JjVUV3tUTUmK9+dKi8Cw==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "41e1ef9d21c0d9ec785f80f1be2220237f5d32dff422245136b27b7beab8b193"
    },
    {
      "path": "skills/guardrail-historic-preservation/SKILL.md",
      "sha256": "cdc0bcc622a7602cedbde4e9cb3a56379f4e569d8b25779904ef00811a37d9f6"
    }
  ],
  "verify": {
    "public_key_url": "https://superagentskill.com/api/public/signing-key.pem",
    "instructions": "sha256 the downloaded .zip, compare with `sha256`, then verify the base64 `signature` as an Ed25519 signature over the ascii sha256 hex string using the public key. An extracted or repacked copy can still be verified via `content_digest` / `content_signature`. Helper: node scripts/verify-package-signature.mjs <file.zip> <signature.json> [public-key.pem]"
  }
}