Just send a PM to DefaultTrust now, write down the PM id and the address in a safe place and you are fine.
I did that, but a PM is not sufficient is prove who I am to others.
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Thats true, but the point here is to prove to theymos who you are. Not as an identifier, but as in: "I am the person that had control over this account on 11.06.2014". If its enough for theymos to change the mail address, its enough for me because I know I can regain control over this account in the future.
Signatures in general can not prove who you are unless you exchanged the public keys in person. I dont know if there is a web of trust for BTC signed messages, but even with PGP most ppl dont even bother anymore.
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I am gonna do this just now to be on the safer side. Do I just need to sent my address or can I include my gmail which has 2fa enabled?
Edit: I sent him a pm with my address, how do I save the PM Id?
I personally have it in a encrypted textfile that is safed on 3 seperate machines, among other information.
In case I got the question wrong and you are asking "where do I find the ID":
https://bitcointalk.org/index.php?action=pm-> outbox -> klick msg subject -> check address bar bitcointalk.org/index.php?action=pm;f=outbox#msg
1234567890the red number is the id.
Thanks I saved the sent pm's information and addy.