{
  "manageEntity": {
    "action": "Save",
    "entityId": "1319883406",
    "entityType": "Track",
    "nonce": "0xd74711b540fef49cdd4b5c4d53e6c410e9de01500a643e41ec9e7ab74fea9f5e",
    "signature": "0xb43574f0fec33abe7b6339f9791821606d974263a174097fc5ed533aefb6f927103bca1241e22ef2e727a0ff5501d5643ba2649b634d2c03ad3785e56acc7fc11b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}