{
  "manageEntity": {
    "action": "Save",
    "entityId": "1318586615",
    "entityType": "Track",
    "nonce": "0x83044fa53e2590e40a12186fe1fb4073e708103120c6dbd12a849bdbd86caff6",
    "signature": "0x4422e4269cc5dabea7e7a4cc736af8b396e2d2385029b6c7c8cc7c98b8c14c8d3a28e14186c42325394c16433d01c7f9a2d06563a18b9a81093b1a350a0139d11c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}