{
  "title": "TUF Targets Metadata Structure",
  "description": "JSON structure for The Update Framework targets.json metadata file",
  "structure": {
    "signed": {
      "_type": "string (const: 'targets')",
      "spec_version": "string (semver)",
      "version": "integer",
      "expires": "string (ISO 8601 date-time UTC)",
      "targets": {
        "<target_path>": {
          "length": "integer (file size in bytes)",
          "hashes": {
            "sha256": "string (hex digest)",
            "sha512": "string (hex digest)"
          },
          "custom": "object (optional application-specific metadata)"
        }
      },
      "delegations": {
        "keys": {
          "<key_id>": {
            "keytype": "string",
            "scheme": "string",
            "keyval": {
              "public": "string"
            }
          }
        },
        "roles": [
          {
            "name": "string (delegated role name)",
            "keyids": ["string"],
            "threshold": "integer",
            "terminating": "boolean",
            "paths": ["string (target path patterns)"]
          }
        ]
      }
    },
    "signatures": [
      {
        "keyid": "string",
        "sig": "string"
      }
    ]
  }
}