{
  "manageEntity": {
    "action": "Save",
    "entityId": "308109768",
    "entityType": "Track",
    "nonce": "0x4e0dcfe9ccb8079b8454454851daf026c341b6010a446d6fce7c88ab8b2d7637",
    "signature": "0xcbc95bd7cdd99a476f74c24278933ae8d5c3fa64e8694e890b70d2a24c02c516044a8d411e89079e261fb2381fbb28f7eb815324709e0749d77b9ea2ce4c47051c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}