{
  "manageEntity": {
    "action": "Save",
    "entityId": "74920849",
    "entityType": "Track",
    "nonce": "0x4cea99a72794cc4ed874b5d59991fea6ff2389fc33ab03b2312d839b13b82493",
    "signature": "0x5a7c136c9a8b0643f11d62e3b927db68c03d9b1169b06fd053b85533906bb3370ee1d3f7f0e4d1c98acbffb78cafd59398d3b7fbb9c4a586b9aa6e2527f45e411c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}