Venture investor Tim Draper said quantum computers pose a greater threat to traditional finance than to bitcoin, arguing banks would be hacked first. He said his bitcoin holdings are safer than U.S. dollars kept in banks and that the bitcoin network could, if attacked, carry out a hard fork to return to a last safe block, though broad consensus would be required. Debate continues over quantum risks and possible quantum-resistant upgrades.

Ethereum and Solana face significant security risks in a future era of quantum computers, an analysis said. Quantum security group Project Eleven assessed that about 65 percent of Ethereum and virtually all of Solana are vulnerable to quantum attacks that could undermine public-key cryptography. It cited risks to Ethereum validator keys and Solana addresses that embed public keys. The Ethereum Foundation and Solana ecosystem developers are preparing post-quantum upgrades, with timelines extending into the next decade.