{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "e240b546a52178a0815ba716caad97c788e0dc75f4aa1c682852bba644dd2e0b",
  "signature": "KY+ZbJ52SWCaG+v1+VxcRflWdWHkmFt7Fm2Kgljaxq+ojGCinIkqf03QfdlMrTTdS/ecvRgwx/qbQbUc8H8eCA==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-23T23:54:09.386Z",
  "slug": "battlecard-builder",
  "version": "0.1.0",
  "filename": "battlecard-builder-agent-plugin.zip",
  "bytes": 3486,
  "content_digest": "109e9ab5ee5e19eb6756b41f31e89c5931073950e25d6ab92b14884bb78d3d97",
  "content_signature": "B5p1lcs2VfFPJ8CqYLxmWWb4889I/vzoO4m2xlnwMeMlXLZCoTp07sF8tRplsWjM5jNuF66sSxaw3odOEj1hCQ==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "ecf76b4566c877230f7304a2dddbd61b5b1a85a13f68960b0c68963d9d2bd3f3"
    },
    {
      "path": "skills/battlecard-builder/SKILL.md",
      "sha256": "27b3a1c918d818872c2e7ef98c78e3a8af2d460db1619a4a5fe882a62b624500"
    }
  ],
  "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]"
  }
}