{
  "manageEntity": {
    "action": "Save",
    "entityId": "1998197592",
    "entityType": "Track",
    "nonce": "0xf6e19bdbefe837596f3a2bca9075ec78a5361b082fa80f0050176e3f55fddb49",
    "signature": "0xab654fe66a8a7baa3e7f26d32d476820e6a166b9f1988cd1988b97d8ef3499577a9d16a9e49bfad01d9ee255b42b0daa329c9c10c006d250fb754821ab9eb0781c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}