{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "d66ee5a147031d5e6880f2ffc117b7f3b88a4c38ebde9ac5cab2ad87008cf107",
  "signature": "C0u3nAIjcaqkVs0nvaPkeXz8TDgOVKKLlkc7Z4oplLbowsYXqNKm76iVx6J1wMw21E3FMicvM7vRQa/pa33yBA==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-24T02:02:18.670Z",
  "slug": "youtube-thumbnail-tester",
  "version": "0.1.0",
  "filename": "youtube-thumbnail-tester-agent-plugin.zip",
  "bytes": 3561,
  "content_digest": "f3615b92d9a6bbce31f86bb58352a69f7df35f1e651a1b5d74e09ee38f83f3c4",
  "content_signature": "nTcGJ1pwte++ppGvFkrraVzOa7jdTwOISSOOYhBG72Bsd4XqPPw2MDTZa61JU1peXDmNSlVxgcMwVMZrhgKOAQ==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "9f8519f9c1e5717e5ac94a27cf7b0fe471c42ec9526b2c25cb18b7fe45471671"
    },
    {
      "path": "skills/youtube-thumbnail-tester/SKILL.md",
      "sha256": "b89da8d913eb9a113bfe6f2f760b97aac764719f42bc3c6b3cbb696a2e0c7d59"
    }
  ],
  "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]"
  }
}