{
  "manageEntity": {
    "action": "Save",
    "entityId": "999587",
    "entityType": "Track",
    "nonce": "0xe23972cd2c9647148573ed1330df417ee338059d9098bcfd66e3d1bb357ddca7",
    "signature": "0xe5401f8bc7bb2a10782dcb68eac7f0cc95c604b6b7b280ad853dce6ca4527d3b1486c46c7f2b31605eb069bbdadda4e4d9a1bbac0073864e3963b17abcc7a0521b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}