{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "02270da83b2cb14a73ad89230e2dcb4501ba45c8435eca7a6b70750adbb64ca7",
  "signature": "QCdGwczulMGxpTo6ypd+wSfwwHYVhrzQkbVBNbJlwkWHsUmjRirl+25U2iBx3aZV8sAXbjWDPIwRiIq4BKE1Bw==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-23T23:23:10.643Z",
  "slug": "shipment-tracker",
  "version": "0.1.0",
  "filename": "shipment-tracker-agent-plugin.zip",
  "bytes": 3458,
  "content_digest": "e430218cc96e53db5107efbe9b1aecffdb09e1d240d27fa5019d35e752205631",
  "content_signature": "x/8+LG/8ERdJnJws7GNPW9abVmymTeG2nOrSYDDDEq1zS/oxfL1g9MotDpEgjapN+0jZwQ+TIAH+GPi8c7x2DQ==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "33a6db4c25c23b6d8d08279d122475956c0317413899ef13acacadba0c0cf7c4"
    },
    {
      "path": "skills/shipment-tracker/SKILL.md",
      "sha256": "5a66be5dc24b8003f0c9254a78ace9cd777831340345359c525d99b4f300663d"
    }
  ],
  "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]"
  }
}