{
  "manageEntity": {
    "action": "Save",
    "entityId": "707255566",
    "entityType": "Track",
    "nonce": "0x2c345c63102c20e984c528d8aa8e57662dd72cd78242ad6c62950b986751dc02",
    "signature": "0x1c470d45cb1ae52a3a04f7a5c8b775afc7f20d023320a0ab5aa762399869f71973815dfec4d0e1efb8c709d1b43e042bddb41e317c7dee8011d37aef1a0ca3bb1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}