{
  "manageEntity": {
    "action": "Save",
    "entityId": "921996519",
    "entityType": "Track",
    "nonce": "0x9999f1dd8f3b70abfb25e02ab9895c5e5284862c72013195bf7cce3be277715b",
    "signature": "0xe81f919ce4078e4b730181714c722a814bfab071d9828316df98577ea94426ff185fb1f93292bbba0bff31559b269e6652546b505e787304e4d86a79cc9ddbd61c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}