S. Uludag

Scalability Bottlenecks in Quantum-Resilient Distributed Ledgers: A Comparative Analysis of Post-Quantum Blockchain Implementations

A comparative review of five blockchain implementations that incorporate PQC mechanisms across multiple platforms, including Hyperledger Fabric, Ethereum, and LACChain, shows that straightforward replacement of classical signatures at the identity layer can substantially increase certificate sizes in some implementations leading to measurable reductions in throughput and increases in transaction latency.