{
  "manageEntity": {
    "action": "Save",
    "entityId": "150404",
    "entityType": "Track",
    "nonce": "0xde02be92e5d6129c983b6f66b71b036ef7762b2b0610f1107c39b07ad6c478ba",
    "signature": "0xf2a3861907cbeddec093fcd5c0ada26b9094af61c69bb4a108abdd23c7d705c3704f83715f5bf0fe4200a86f1d3d3762090e5896e6fb80398f12339f1f30dad31c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}