IF a time traveler goes through the trouble of obtaining an internet provider source, routing through proxies, registering an e-mail address, and then going through the registration process here at Time Travel Institute to say as you mentioned " Here I am ..." ; then they should indeed desire to provide some proof that is worthy of consideration to US here at Time Travel Institute.
Any time traveler that has any intelligence, would certainly read through the site before making a decision "to" post here, and would know what they were in for by doing so.
And if it was some sort of entertainment on their part...to mess with the natives...by responding to a test would certainly accomplish that goal.
To those that are scoffing at the idea of "any" test...I have yet to see any suggestions as how "they" would determine if any particular claimant "here" at TTI is "real" or just a "hoax" ?
Unless they are part of the "I believe it because they said so" clan.
Even by seeking flaws in the current time traveler claims, is applying "test's" to the claim's anyway. We are actually providing a service to the claimants, and providing them with a method to "cut to the chase" as it were, and avoid lengthy threads of questions, and get to the meat and potatoes of their time traveling experience(s).
IF any time travler was of the mindset to not even bother with a forum such as this...then there would be no need for a time travel claims section at all, which at one time did NOT exist, but had to be created due to the volume of claimants, and more importantly, the length of the claimants threads as they attempted to convince everyone they were indeed "real" time travelers.
This is all about making life easier for the "real" time travelers, and seperating them from the fakes.