Blockchains are facing a slow-moving threat that cannot be ignored: quantum computers. These computers could potentially break the elliptic-curve signatures used by major blockchains to prove transaction ownership. The concern has led layer-1 blockchains to prioritize post-quantum security alongside scaling and modularity.

Quantum computers pose a specific threat to public key signatures used in cryptocurrencies like Bitcoin and Ethereum. While hash functions are more robust, signatures are vulnerable. As quantum machines advance, networks must plan for long-term cryptographic upgrades to maintain security properties.

Layer-1 blockchain teams are now including quantum safety in their roadmaps. The shift was prompted by the standardization of post-quantum algorithms and migration timelines set by governments and enterprises. Networks are beginning to implement countermeasures to ensure long-term security against quantum threats.

Several layer-1 networks are actively preparing for quantum resilience in their systems. Algorand has introduced State Proofs and live post-quantum transactions using the Falcon signature scheme. Cardano is working on a research-first roadmap, while Ethereum, Sui, and Solana are exploring quantum-safe options in their protocols.

Upgrading to post-quantum signatures on live networks is complex, impacting everything from block size to user experience. Different signature schemes have varying implications for blockchain operations, requiring careful planning and consideration of migration strategies. Networks must decide how to transition without disrupting existing users.

Users, builders, and investors should monitor how networks address quantum readiness. Pay attention to discussions around crypto agility and anticipate new account types and hybrid signature options. Developers should prioritize flexibility in their designs, while investors should assess networks based on their post-quantum roadmap and implementation of quantum-safe features.

Read more at Cointelegraph: Quantum Security Lands on Layer-1 Roadmaps: Who’s Preparing First?