{
  "manageEntity": {
    "action": "Save",
    "entityId": "1087403",
    "entityType": "Track",
    "nonce": "0x00a12d59f7509c5eec9ae0b8691143d3275d7f36504a1d72fe40cd8a463313a6",
    "signature": "0x2ff0dbe255cda30bcd05fc3cfd54218338cc44dc80a815a7554a0f864dbed708565cc88b50e1e7fb5f5b95e63a940d930884ec800aaf7dba7f53b779df2743941b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}