Brian Armstrong, the CEO of Coinbase Global Inc. (NASDAQ:COIN), brushed off quantum computing threats to Bitcoin (CRYPTO: BTC) and cryptocurrencies at large. Armstrong Says Quantum Risks Needs ‘Diligent Effort' Armstrong posted on X, sharing a clip from his March 18 interview with Norges Bank Investment Management CEO Nicolai Tangen, where he stated quantum computing demands “diligent effort” but isn't an “existential” risk to Bitcoin.