{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "3d80675f2365ab87097d157f852323b4c9abe2ee39478911ed03de0cb359e787",
  "signature": "sJqMquG1TTpWrl0juy1iZRx5TZbRnfeph2TuOv4V0hnkQNbA+w7dxlY0/zIcunle4LHfs/Lu4ByqW3ZEoi6PDQ==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-24T02:02:18.534Z",
  "slug": "legacy-cold-email-skill",
  "version": "0.1.0",
  "filename": "legacy-cold-email-skill-agent-plugin.zip",
  "bytes": 3333,
  "content_digest": "ed3a909922b5f0a56541a231d8d27c31b7778c2df21097e63e1980c8562ab867",
  "content_signature": "f2I0Gl6Mrc43lqFbRC0UBa8UpyFLfFaIVhoxYpFOkmg1EfnlOXxgkEziRL/ic0Rp1JXc+zyUl2Wbj4xQ7ov0Ag==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "5e43fe319af90104828d62de35dbbff3453abb53a6aa147e08e63dcf82bde252"
    },
    {
      "path": "skills/legacy-cold-email-skill/SKILL.md",
      "sha256": "4314925bb043726d57cef37fd2a778d85e0a290523ccd34a704845afd4959b5f"
    }
  ],
  "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]"
  }
}