> If they can crack the cryptocurrencies then it means that they can easily crack crypto of online banking systems as well They're very different because the b

> If they can crack the cryptocurrencies then it means that they can easily crack crypto of online banking systems as well They're very different because the blockchain is public. Getting access to a bank's database touches a lot more systems and algorithms. Even something less interesting like intercepting web traffic to (or between) banks isn't interesting because you need physical access to the medium and you'd need a hole in TLS. Like Bitcoin, TLS uses SHA-256, but breaking it probably doesn't give you access to any plaintext, and you could force a downgrade to TLS 1.2 to use MD5-SHA-1. This is only per-connection; the Bitcoin ledger is set in stone.