What happened: Bitcoin and Ethereum developers are actively working on separate strategies to safeguard their networks against potential future quantum computing attacks. As of October 22, 2026, neither network provides a standard wallet option replacing current transaction signatures. Bitcoin developers are exploring proposals like BIP-360 (P2MR) to remove direct key-spending options and SHRINCS for hash-based signatures, though both remain in the research and draft stages. Meanwhile, Ethereum leverages its smart contract flexibility to test alternative signature verifiers like SPHINCS- and drafts like EIP-8141, while hardware makers like Ledger are beginning preliminary support.
Why it matters: While quantum threats are not immediate, preparing blockchains for a post-quantum future is crucial for long-term survival and security. However, everyday users cannot use these features yet, and existing coins remain protected by current standards, meaning no immediate changes are required for holders.
