Quantum Risk Looms: Crypto Industry Faces Scalability Crisis

The crypto industry is facing a scalability and governance crisis as it transitions to a post-quantum future, according to a new report from Quantus. The report argues that legacy chains like Bitcoin (BTC) may struggle to migrate before quantum hardware reaches dangerous capability thresholds.

The industry's biggest problem is no longer whether quantum computers will break classical cryptography, but rather how decentralized networks can coordinate a migration to post-quantum systems without overwhelming scalability limits, wallet infrastructure, and governance processes. A standard Bitcoin transaction using ECDSA signatures carries roughly 97 bytes of signature and public key data, while a comparable transaction using ML-DSA-87 would carry approximately 7,187 bytes, representing a 74-fold increase.

This increase in transaction size could sharply reduce the transaction capacity per block unless Bitcoin undergoes deeper architectural changes. The report describes this challenge as the 'Great Quantum Filter,' where capital may begin moving from quantum-vulnerable blockchains toward chains designed with post-quantum cryptography from inception.