{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "d8ab04f6e2ac2bc9ac0509c8ea3db757d181a707caabb6df24224ee3986d3dd6",
  "signature": "V9Q7bgXMnvGQX5RVZduXik5PDbb2txqrQyLKYpIEC2zK25UUBrrnwk6yZjTWNCfAjRy5QWjplJf5dIGrNEXaCg==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-24T01:08:59.355Z",
  "slug": "music-prompt-engineer",
  "version": "0.1.0",
  "filename": "music-prompt-engineer-agent-plugin.zip",
  "bytes": 3547,
  "content_digest": "bc48982bf980169fc1215234db53d7e441be19dd34043625e212145a18e501e5",
  "content_signature": "nvXUd+qFqejqkho1ij6vjlJtAWWzcqYbnt3e+3BOnPowiHWyEkLhGc+PmC6g0Ki2U7N+jGnrAyJpqFdX5siuAw==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "ff62b760cbcce4e6ed745ed5c68021351733c3b7d65e5e154ea833269e6d18d2"
    },
    {
      "path": "skills/music-prompt-engineer/SKILL.md",
      "sha256": "7dd9a827ab0a591b9d97ee8c5e11b75dd0fe17de75d56d7653970dbcd03819f7"
    }
  ],
  "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]"
  }
}