{
  "manageEntity": {
    "action": "Save",
    "entityId": "1003861929",
    "entityType": "Track",
    "nonce": "0xb8ded27ebcd7416b00dbf89ee68da860269e38219c987dbbe479f7078b1be9c8",
    "signature": "0x7f617703d6a141ed545412b25c0369f14e80501cecb852301437b99c74ee96c0301a3d2ae33215290cb845745a129453a766a1ef02226a629312f86785b1d2031b",
    "signer": "0x0168976438910D2f5330323a0d0141Fb4Af95032",
    "userId": "317847"
  }
}