Citi: Bitcoin may face higher quantum-computing risk than Ethereum, report says

On May 19, 2026, Citigroup researchers said Bitcoin could face greater long-term quantum-computing risk than Ethereum, citing slower governance and the difficulty of implementing major protocol changes. The report noted estimates that practical threats could emerge between 2030 and 2032 and highlighted exposure of public keys during transaction broadcasting. Citi also flagged 6.7 million to 7 million BTC in older wallets with already-exposed public keys, including about one million BTC widely believed to be tied to Satoshi Nakamoto, valued at more than $80 billion.