Hmmm. This indeed sounds like something which i don't think you can do very much about. AFAIK, you'll be unable to sign a message from any of these services you mentioned, since you don't own/have access to the private key.
I find a couple things very weird though;
1-The email address I had registered with the freebitco.in, got blacklisted by protonmail (Apparently, so many people had registered from the same IP...this is a University Internet Connection meanwhile) I have been
you had a protonmail adress? And they simply disabled it?
That seems like a big deal to me? I've registered multiple Protonmails from VPNS/tor, (albeit they're phone verified), it would be detrimental to me if they were to suddenly close these accounts, without any warning...?
2-I tried changing my email address in freebitco.in, but failed as I have to verify the emails being sent, yet I cant long into the email.
I contacted support, they were quite helpful, the person told me to sign a message from either the account that had sent the bitcoin or from inside my freebitcoin wallet.
Now, there is no way of signing a message from the freebitcoin wallet since its a public wallet. The wallet I used to send the BTC to the freebitco.in account was actually a market place wallet, which makes it also impossible.
Hmm. That also seems pretty weird. I wonder why they mention it if it's impossible. Staff should've known, right? (Or are we missing something?)
I'm not entirely sure if this will do anything, but perhaps you could try contacting
TheQuin, and see if he can mean anything to you?
Yes, they disabled it. I actually used a VPN and even Phone Verified the emails, even if it was a Univeristy Network, which I thought should not have been a problem. I explained that clearly to the protonmail people. But they somehow still believe it was abused....been going back and forth with them for about 5 days now, they agree to restore it, then another person I think responds and is like its not possible, then next day they are like explain the situation clearly...to be honest, this has given me too much headache.
As for the freebitco.in support staff, I clearly told him/her that it wasn't possible to sign a message from my account without a private key, and asked if they could give it to me since they were insisting, I never got any response again.
Only response is, sign a message from either the sending wallet or your account and am like what am I missing here? I sent freshbtc from my newly created wallet, signed the message as proof, but still you want me to sign a message from a marketplace wallet which even after reading through almost 50 different threads, I know is impossible.
As for sending btcoin from my Dreammarket wallet, I think those guys change the wallet ID every 2 weeks or so. I don't know if it's be the same wallet, I would have to see if I can contact anyone in their support (If at all it's even possible) To see what happens. But I can surely still send BTC.
So am just there wondering what next to do! But AdolfinWolf, I would recommend that you be careful with the protonmail guys, they are good, but for some reason they can be really hard! And the truth is, you wont be notified, next time you try loging in, you just see email disabled for abuse...
I have asked several times, what they mean by abuse, what happened to warrant the abuse? Haven't gotten any clear answer.
Let me contact TheQuin and see...