Signature, formerly Unkonwn6, contains some critical data used for Anti-Cheat detection:  
  
- Device information like brand, model, firmware, root status
 
- IMU / orientation sensor data (gyro, accelerometer, compass)
 
- on Android: details about every visible/used in fix GPS sattelite
 
  so when you...  
  
- played on Nox/BS: you yelled "emulator" everywhere + 3.
 
- GPS spoofed on iOS: sensor data not matching walking
 
- GPS spoofed on Android: 2. + sat details were empty/zero
 
- used IV checkers / 3rd party API tools with your account:
static/zero values for sensors+gps, different, not unique device 
- API usage before u6 was *****ed: you sent no signature at all.
 
  (if you only spoofed yourself to a static location with iOS, not  teleporting and having the position set before opening the app, you are  probably fine, because aside of your ip, data resembled a phone resting  on a park bench or smth, which got picked up only for catching an  encounter)