{
  "manageEntity": {
    "action": "Save",
    "entityId": "1999343969",
    "entityType": "Track",
    "nonce": "0x46e9b38609310c9d418829be5e775db8e2d1d8391124f472bf70d11c947c65dd",
    "signature": "0x8bc9664011dd031fc1232fac2172d732e7942a923508bd6b96004d8bff00233118bb32b8141762814abd7e32879b17eec7b3480ec6332032e93c2b450a59c9ec1b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}