{
  "manageEntity": {
    "action": "Save",
    "entityId": "209895978",
    "entityType": "Track",
    "nonce": "0x7ca3f3dc1af5162742e40e0ab3d970fb6dbf70b43c0be73b380cc60016b0e4ca",
    "signature": "0xa5b8c3f13bfa0789f60ff30aa6abbecac2cd792afb14353b064d897a00012ccf5eefb35465a68d03e6d4c117725dc575f6e8896b8bac5ceb7b1f09ada61240fe1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}