{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "66c65cca35e1dcbf2097e795dcaae2406942ed59b6e61f03f2a50f881be0ba80",
  "signature": "zB/Gnuams18n3l/RBU3iE/l7pzzFboyCuUSLr/MCTdAD+qNJmJVQpdOscfs6TYfokC/EHSWPnNYznGRgZIOoBw==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-24T00:52:50.609Z",
  "slug": "gx-hubspot-expert",
  "version": "0.1.0",
  "filename": "gx-hubspot-expert-agent-plugin.zip",
  "bytes": 4681,
  "content_digest": "4814a827c1d5ffdb65c5fb5d97480442c384d60be85628bbff55d22fc60e7cd5",
  "content_signature": "tiv4xlNvdMcPnUKeFdDXvr7erYhmJBSmjIm0F0WA0prrRd/qE1BOBt6qC2C0Hzqwzp3Y9J7BjuZ/c9+hhyyQAg==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "123df7e64313e3acd66a94ce88316cfb0a1aedf180d79f554203504aba4d51dd"
    },
    {
      "path": "skills/gx-hubspot-expert/SKILL.md",
      "sha256": "c2a4b204fb78106d61ec1b3e3c8989dd6f8c1668f6f00ec5fe52a7725b752079"
    },
    {
      "path": "skills/gx-hubspot-expert/references/examples.md",
      "sha256": "313bc2aa55ea0466f8c4b20f9bb7275956a8080d9d219f48aafbd6e903116b58"
    }
  ],
  "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]"
  }
}