{
  "manageEntity": {
    "action": "Save",
    "entityId": "1593897335",
    "entityType": "Track",
    "nonce": "0x63735c0ab281613c5c4c4c7ba521cba5d79174e1a4e0eecf8c0a53c5b979b11a",
    "signature": "0x874358eb5432ddf1b9116702a24fb902a6307fbb558c6736ebc4d9ab1b13640c1e8fd8211c32790b59ccc4bbbeddece3cc076afb1761503ef818e80547e161a81b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}