Often, you need to prove ownership of the account with a PGP or Bitcoin signature. This has two steps:
it says often not mandatory, did you get any reply on you recovery request yet?
... I already sent e-mail from email my account, but I - as I already said - have no signature BTC. I have no BTC, I have only altcoins...
I understand, I have little chance to recovery...
if you still have access to the original registered email address, you still have a chance to recover your account
just be patient and wait for your turn, they will need to do some checkings first
once the manual recovery process has started, I think you need to wait a week for it to complete
here's a thread of recovered accounts:
All the Ownership-Changed and Restored accounts