{
  "manageEntity": {
    "action": "Save",
    "entityId": "1243853762",
    "entityType": "Track",
    "nonce": "0x11b7864d10a17637c7cdbceb1cf29d2669590db53369d23b3d13c2216a65fc8a",
    "signature": "0x6a701a2609ff01ade51d1deda103cecfd3ff79fd588f8c42aefcda9652f208ef0651f4bd30a3970073facec07a9957800e232d55f146c4773af09d8b1569dd271c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}