Blockchain Networks Struggle with Quantum Upgrade Coordination

As the world inches closer to a potentially quantum-powered threat to blockchain security, many experts are grappling with the question of how decentralized networks will adapt.

The National Institute of Standards and Technology (NIST) has already issued guidelines for transitioning to post-quantum cryptography, but public blockchains like Bitcoin and Ethereum face significant hurdles in implementing these changes.

The issue is not just about upgrading protocols or nodes, but also about coordinating the efforts of millions of users and wallet providers. Yoon Auh, founder of BOLT Technologies, notes that this coordination can be a major bottleneck: 'The hard part is not changing the node itself, it's having the wallets do the same.'

Permissioned blockchains, on the other hand, may have an easier time due to their tighter governance structure. For example, the Canton Network has already begun testing a system that allows institutions to use and switch between multiple cryptographic signature schemes.

While permissioned networks are not immune to the challenges of post-quantum migration, they are better equipped to test, approve, and stage upgrades under real-world constraints.