{
  "manageEntity": {
    "action": "Save",
    "entityId": "1221419587",
    "entityType": "Track",
    "nonce": "0x2dcfb4a1f13b38822bd8748ba8f4583860d5add8c976151976892e342e4488b8",
    "signature": "0x90ce99b67a94237155c1114c4698730bae727d5cf742b49c9523b6247b8411040ec95b051e53a08216713d91af1bebb405a2b8159ec62563067c01c8d0a5965f1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}