{
  "manageEntity": {
    "action": "Save",
    "entityId": "541265",
    "entityType": "Track",
    "nonce": "0x3f6cc1596355b5a5effab17adc20323b700a83fffbeeb87e8b65fec559129a84",
    "signature": "0x7b9ec7ff00b5e31fcc80e68997a4e759ccb07379f987056ac98fc732811585a547d01ca49cb0909bfac171cc0bb162d76fd3f204eb3861e3e6b61f6fe355905b1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}