{
  "manageEntity": {
    "action": "Save",
    "entityId": "1597677323",
    "entityType": "Track",
    "nonce": "0xa4b758f688fce315c3ae81cb54fcf009c0d88ed8f179c3462a03e1aefeef3005",
    "signature": "0xdbd5f1fd6b913088027c706113cc66bc5640373b35fe7c91adfce5e10889defc5966509b9c58f888cbca0e05cefce0db237c5ab7de32076b50857d87357a72b11b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}