{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "61d29d6208a0be536010163d89990ceafc6798b131f6733f4fe99ccd85ce7336",
  "signature": "2ZA/UthdAy6qdK4WT/k5qWlyvp/IMHbWmkbYncaIfk9RW2CW8hHQ+yXt07LY3p54NWCA+VEA44qq5aVsxfDUDg==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-24T01:09:48.997Z",
  "slug": "gx-lifecycle-email-expert",
  "version": "0.1.0",
  "filename": "gx-lifecycle-email-expert-agent-plugin.zip",
  "bytes": 4868,
  "content_digest": "d122ff8c1c90cb8a8a582db3bbf95e5e725b861e9ac8957e43a40592910dbb0f",
  "content_signature": "KKCp+X0UufgbPI4jmxGwyG8RodMK18lxE+m3GQtIKFZMwG9ODS4HTc2pXiAiffQLnlef9NGs/teQQwJwXyUEAQ==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "2f9ee019544255f13b1a732310695d60ea69081f1bab92109b056e6f5d25a188"
    },
    {
      "path": "skills/gx-lifecycle-email-expert/SKILL.md",
      "sha256": "f7de7207f24a73a1f3b9597f0f0632d22896c32fcf2446f0e905e5939b50448e"
    },
    {
      "path": "skills/gx-lifecycle-email-expert/references/examples.md",
      "sha256": "fbc4aba97130946884ad56f861b2a0db8a376ef14e7966b929c85e1be1b859da"
    }
  ],
  "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]"
  }
}