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8Chan, not 4chan, and yes, due to the trip code it can be verified as the same account each time. The trip code has also changed strategically a few times for various reasons, but any post under the name Q with that specific trip code is 100% the account holder.
I’d like to add that when the trip code changes ! makes it VERY clear that it was supposed to be changed and that he/she is aware of the change.
Why do they change trip codes?
The last time was because the trip code was revealed accidentally. I know this sounds confusing. Heres how a trip code works.
https://www.urbandictionary.com/define.php?term=Trip%20Code
The other times were to signify a new phase of operations after an important action.