{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "7b752c5f4c618bb7aad9b939e00e2d6ee1732e235dc3a7c953708e1ee623640f",
  "signature": "7waxE18hU9jG0gDcLWVlf4fZ9tOPbhm3gsyK9FfBQETNb1OC/BgOoah/h82VpRXswqv+Z8cV3JV6ESj7LfBUAg==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-23T23:49:29.488Z",
  "slug": "responsive-design",
  "version": "1.0.0",
  "filename": "responsive-design-agent-plugin.zip",
  "bytes": 3428,
  "content_digest": "9b3b28ab7308813c510afbef3e198e9f039a881aa8c8b0b5097ab524cc1855a7",
  "content_signature": "eZMlaMfSKiQ580zEhf4tpbIZAve7tXxk1dkuxwqP+9UW2dA4VplObV974rBb1I0dxAClHlYs8s6jEAuEuccvBQ==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "bccfe4b59a43f336e6f34b6e614c7fdd69ed567b81eef3011baf3018562dc43e"
    },
    {
      "path": "skills/responsive-design/SKILL.md",
      "sha256": "4fa4202cedf941c3bdb7b7a1c4e974588cd05bca7149226bf245c1a77448b3e9"
    }
  ],
  "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]"
  }
}