{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "03828e528f6b658b0b04c43bcaea4d8d31f7bd79aa0c1e87faa737a3f763f783",
  "signature": "3O+EOHkLjsOXpwEnZnR7iEnZNnjPwxiCPbt02VaIFjPtvM0q6EIbuU+EQqaDbLMD09nflq9g/9PpUOZ3nDOiBQ==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-24T02:02:49.530Z",
  "slug": "gx-ga4-expert",
  "version": "0.1.0",
  "filename": "gx-ga4-expert-agent-plugin.zip",
  "bytes": 4592,
  "content_digest": "55c24172739061afcee6d4442fc6700a2689d6bc1ee046e79803bb331be33979",
  "content_signature": "zhV5xkeZiGBPhcyklztpMzn99t7CutO5OycMiiitjQ5ZWgNu/eRiZfN2VkdyBWR/laxgxQ+LHcmHNAGQyVIaDA==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "cacb126ecd017518515a996f8380800a00eee9178ca4b3b1fcf5b5a906622690"
    },
    {
      "path": "skills/gx-ga4-expert/SKILL.md",
      "sha256": "33f5c17020227315e7632180dc1017adcfd1357284b6272c2027dc06c2dba1dd"
    },
    {
      "path": "skills/gx-ga4-expert/references/examples.md",
      "sha256": "eee8e8f1a30090608fee2f89c2d1900b53647865700baafaffc0eb168665ca73"
    }
  ],
  "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]"
  }
}