{
  "manageEntity": {
    "action": "Save",
    "entityId": "949666042",
    "entityType": "Track",
    "nonce": "0x37918cd9c40c9e103802c53b7011e6396b5bcc9cb1a8d4a26570537d007a0232",
    "signature": "0x0f020efcc0986f3bd17e2027399b227c57ddaed03b6e518c63b45d8d2299ea29720dc437234fa37b8361cb9fb9f0b5adc802281f923adb4c06daac314213342c1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}