{
  "manageEntity": {
    "action": "Save",
    "entityId": "451173317",
    "entityType": "Track",
    "nonce": "0x3906edb0cff49d69d75add31a0613058f93bc1141d29521ec71e17224ece386f",
    "signature": "0x6fec401cb51baa916f9eb4091763e9ff48606f879784b622a63a51ca79844d1916368d5924a4acf976ea963cb1b771f10fb1ec5a6a002b94280f375fd6b3f3df1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}