{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "9f4720ca1df6dd1ca6c945b35d4521441947b090f7981cef5576def63319e22b",
  "signature": "HjkgEydOTZL81s2NPQNXrQ+dq2uSg4xVa/YIwVWvdCyfUHOSRqjWiLiy2MBoqQum2jxATSyB50qVWf2kKBQJAA==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-23T23:38:12.575Z",
  "slug": "web-performance",
  "version": "1.0.0",
  "filename": "web-performance-agent-plugin.zip",
  "bytes": 3485,
  "content_digest": "917218bb1d6c7e8f852a59d37c3d218085d2aaee082cab5fe5413b8500885ca2",
  "content_signature": "Lc/Kr+C4uB6vXucLnAKnVF3GLCA5gY5qz9Ev7df9SYIxNrRaLuz3V1aq7bM86L6zw132Rwtw4xit3YmhxqH6DQ==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "eea8783529eb34a10b8c3610bed364d6f2be0223bfd447b76cce14b2d52ea66e"
    },
    {
      "path": "skills/web-performance/SKILL.md",
      "sha256": "af2f7b29273708cd95444278f7e542ea16b007984bd184d6d655fd8c7e42ffbc"
    }
  ],
  "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]"
  }
}