Ripple ex-CTO says Bitcoin may need a hard fork for quantum security, while XRP Ledger can upgrade without new addresses. Ripple Ex-CTO: Bitcoin May Need Hard Fork to Survive Quantum. That was the warning shared by David Schwartz, also known as Joel Katz, during a recent discussion on blockchain security. He said Bitcoin may require … Continue reading Ripple Ex-CTO: Bitcoin May Need Hard Fork to Survive Quantum