{
  "manageEntity": {
    "action": "Save",
    "entityId": "517784",
    "entityType": "Track",
    "nonce": "0x8ff8a3dd594ebf815c905e0903fb4365c615b565d52b22077e08477b73a529f3",
    "signature": "0xa6ed6e49d25e319deeb935a41738ad37cb1016ffdbee7aab3e0b4df3856bd93c3ab82a622130af18658ca42fe307f17345d31f72e0894d3c3fcd45b20945fd831c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}