How to check account usage on one device?

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v- death2015-10-31 04:42:09

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v- death, 2015-10-31 04:42:09

Hello. I used json web token. Now I'm racking my brains for a couple of hours about how to check that this account is online on only one device? (Different browsers can also be equated with devices).
Thanks in advance for your help with the development of the algorithm.

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Alexey S., 2015-10-31
@Winsik

https://panopticlick.eff.org/ - there is a pdf "How Unique Is Your Browser?" with a description of how to identify any device based on a bunch of parameters