{
  "manageEntity": {
    "action": "Save",
    "entityId": "1213473559",
    "entityType": "Track",
    "nonce": "0xa93e041591856bb96b4a35dc13cc2b21797178979319291f5a6e1f19c77d1661",
    "signature": "0x4454be88bab347a26084ee2c4ccfb9ce9dd14aefb352902a9140fa13494803ca66e68c88986b172526ea456a22b8be4ee3ba0c555c1440f456cc2e3eff658a591b",
    "signer": "0x7ceA71B4A8C4013A4f57c1A57eC0430915572e86",
    "userId": "31724295"
  }
}