Does Wireguard work in such a way that there is no trace of its existence to an unauthorized contacting entity? I used port knocking for a while many years ago

Does Wireguard work in such a way that there is no trace of its existence to an unauthorized contacting entity? I used port knocking for a while many years ago, but it was just too fiddly and flaky. I would run the port knocking program, and see the port not open or close. If I were to use a similar solution today (for whatever reason), I'd probably go for web knocking. In my case, I didn't see it as a security measure, but just as a way to cut the crap out of sshd logs. Log monitoring and banning does a reasonable job of reducing the crap.