{
  "manageEntity": {
    "action": "Save",
    "entityId": "619065421",
    "entityType": "Track",
    "nonce": "0x64e4df67f3a2c53199409540d19cb167b7a1fc9532177f1ea623b0e5f35ccdec",
    "signature": "0xd3692e1a76a46b20159a7bf446fec83cf94995cffc97cce3994f202a0a37c7160e36d581e7edd378699376c63a5ae73865d17c5c3a82c8d897481255b854a1e31c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}