Bitcoin and other cryptocurrency protocols have a window of three to five years to address post-quantum security concerns, according to Bernstein. This assessment comes despite a report from Google Research indicating a significant reduction, approximately 20 times, in the qubit requirements needed for potential quantum attacks. According to NS3.AI, Gautam Chhugani of Bernstein stated that the risk posed by quantum computing is not existential for cryptocurrencies. Instead, it would likely necessitate protocol upgrades rather than an immediate and comprehensive overhaul.