{
  "manageEntity": {
    "action": "Save",
    "entityId": "544308",
    "entityType": "Track",
    "nonce": "0x5423d01350601349a7440f0b84ebf7d21fb24fa38cc17f3b993117261ee08e3b",
    "signature": "0x599e6cb62522782cc9805f003f069a1d206a69ca431329aec3689db1d5578ea05984523157ba31f167ae466aa8c04221c8343e35c8dec908b0d29c4f0515e68d1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}