21Shares Warns 24 of Top 26 Blockchains Lag on Quantum Defenses

3 articles · Updated · 21shares.com · Jun 4

21Shares said quantum computing is not yet able to break Bitcoin, Ethereum or Solana, but allocators should prepare now because the response window is already shrinking.
Google-backed research in March 2026 cut the estimated computing power needed to crack crypto protections by about 20 times, while Bitcoin alone may need five to seven years to migrate.
The report says the main danger is loss of ownership keys rather than blockchain history, with risk concentrated in bridges, treasuries and operators; bridges have already lost nearly $3 billion since 2022.
One threat is already active: attackers can harvest exposed account data now and decrypt it later, a risk the U.S. Federal Reserve has called present and ongoing.
Governments and tech groups are moving faster than crypto networks—new U.S. national security systems must use quantum-resistant protection from January 2027, while 24 of the top 26 protocols still rely on older methods.