Yeah, i honestly didn't know i'd have to " sign " anything. Really regretting the fact i re-formated my PC.
The only thing i got to prove it's been mine this entire time is the loads of emails stockpiled in my inbox. I'll try and figure out if there's anyway i can find a backup of my wallet or something.
For your Full Member account, did you ever post your Bitcoin address on any post older than 3 months. I don't think email address would be as useful in proving your ownership of the account than a signed addy.
