{
  "manageEntity": {
    "action": "Save",
    "entityId": "5478321",
    "entityType": "Track",
    "nonce": "0xf48cc18eb23a2632a6740d349c5c957f0e13519c557cee600a501dc313b747cb",
    "signature": "0x9a07cec190c31c0800e35c540c7ede7b7138cb34e7c981aabd37edaa1ead0fa55c5adc17e5ceb49d8f92e6bc57b434b55ebcb62cbf8bf65d112d8e4df04a49061c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}