{
  "manageEntity": {
    "action": "Save",
    "entityId": "1500368896",
    "entityType": "Track",
    "nonce": "0x3a144c4be4eaf3daac15fcacdfbb9e12a88be9499af8df9df1626e4bd6fdf7c1",
    "signature": "0xf68c372c8dff7ad1e41e2536a72a1453a1fdfda0dfa606a43e53280660b1a3b91ebc2d40cb869f738e28b7be95cbb9b8fbe5676fafaecced4414f7a4e0e677071c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}