{
  "manageEntity": {
    "action": "Save",
    "entityId": "349969375",
    "entityType": "Track",
    "nonce": "0x96af935c810308bda7c881ed5d2c1f5ee4bd58ddb510fa4ee47ead92b67753f6",
    "signature": "0x7c902606fb1171cb7befd7386dfcf6dec410fc267bd59f8b46e2a4810257dfd640ef4c5388700f1f04622b0684d240d539040745d1aa6d8b9fc0632fa807d50e1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}