{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "5482140f92a7c0ad9df589659651302bcca1fcff1dce156dc3c5c0bbab318e8a",
  "signature": "Cexk2r2tTyPyfnLZ4Kh0Vs78E7BPk6C+eEvcecEYSDNg7wweDpAfD7ri2AYiQOttscFfwPKjUohe53QhLZ5ADw==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-23T23:23:49.577Z",
  "slug": "spec-writer",
  "version": "1.0.0",
  "filename": "spec-writer-agent-plugin.zip",
  "bytes": 4078,
  "content_digest": "bb388f4b6c100e5b9024a75735a8b8eb63e08b17f7b240289db4581196ba8fdc",
  "content_signature": "W6HODYQT72iIlKwGH6VxgwQSBL77s7JUOu+ys/ZvXq7ceRx6xGHs43UmAVkAXm+Lq+91joI+Hi1r5KPmWuoDAA==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "4d0707540bfae7262f1663848633d2d1a1187e4a0ca575c7242aed1c1dd94b12"
    },
    {
      "path": "skills/spec-writer/SKILL.md",
      "sha256": "908e8e01e8da1adc3bdca9013206cdccf4c3c9bb3274537a4e498384bb95b93d"
    }
  ],
  "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]"
  }
}