{
  "manageEntity": {
    "action": "Save",
    "entityId": "203049872",
    "entityType": "Track",
    "nonce": "0x02e15b776259877f224deaabfca62cf1bade8e4b1fcf7dbf66c9edaae7b275f0",
    "signature": "0x3a9e6002e300b7a402dbc230471d5a2ca2fdc3a32ef64110af0b3b9f3f9c678940db40df01dae48ecbee34792b359f972a15bb3b91e1ad67913177816e2173131b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}