We don't know if he is alive or not.
He left some unique things. Using those things we can verify the account owner.
He has a website that is still up but not updated.
http://tomostasks.website/ (Nudity inside)
The website redirects to
gaysfinder.life (NSFW) I am not sure if that was the owner's intention

Thanks for pointing out. I would never know if it’s possible to use same domain for different purposes. Just remove S from https and you will be on main website. Http will lead you on the main website. But, https redirects to some random NSFW website. Would you mind edit and fix?
[/quote]To prove that he is the original owner of the account, he should be summoned to sign a message from this address or else I think it will be safe to assume the account changed hands[/quote]
Right. Based on my information, Do you believe the account changed hands? Or Let's wait for him?