Been having issues with Google/Reddit etc. lately as well on Proton, managed to get around it by switching to a new IP subnet. It’s likely they’ve just blocked IPs with malicious users behind them, which sucks for the rest of us.
The public part of it would be the RSA pubkey, likely linked with an identifier such as the SHA-256 hash of the email. You could quite easily have that ledger public and it would take millennia to crack any of the emails, much easier to use fuzzing with common words and names than trying wasting computing power for a single email. The whole point of blockchain is that it’s an immutable public ledger which would actually suit this idea quite well.
Been having issues with Google/Reddit etc. lately as well on Proton, managed to get around it by switching to a new IP subnet. It’s likely they’ve just blocked IPs with malicious users behind them, which sucks for the rest of us.