{
  "manageEntity": {
    "action": "Save",
    "entityId": "674630798",
    "entityType": "Track",
    "nonce": "0x15114736e840e047d286780d3bc84506d6b07196e65285f709df011e3eacd4f8",
    "signature": "0x569da354e904e38cf45c66170805673658b76d5a9b8fc4cfa9a14b01fc3f6cbb28f40452ae3ba0e32c8dd88a7c00819415296ac4114031264f02894e78d603ac1b",
    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}