Two major blockchain networks, Algorand and BNB Chain, have independently published plans for migrating to post-quantum cryptography, addressing the long-term threat that quantum computers pose to today’s cryptographic standards. Both proposals aim to protect account control and consensus mechanisms, but they take different technical paths.
Algorand’s Three-Stage Strategy
Algorand outlined a strategy that moves beyond protecting historical blocks to securing the live ledger, focusing on account control against Shor’s and Grover’s algorithms. The roadmap is built on existing work: State Proofs deployed in 2022 already use Falcon signatures for quantum-resistant historical attestations, and a November 2025 milestone demonstrated MainNet transaction authorization via Falcon through account abstraction. The current phase tackles account types—single-signature, Logic Signature, Application, and multisignature—each requiring its own migration method. For single-sig accounts, the proposal leverages Falcon account abstraction to rekey Ed25519 accounts. Program-controlled accounts may need salting or typed addresses to prevent accidental quantum-exploitable paths. The long-term vision introduces native post-quantum accounts as first-class protocol primitives, with Falcon becoming a core standard. The plan emphasizes opt-in, gradual adoption to avoid disrupting existing applications or custody arrangements.
BNB Chain’s Feasibility Report
BNB Chain released a technical report on post-quantum migration for Binance Smart Chain (BSC), grounded in the NIST FIPS 204 standard (ML-DSA/Dilithium). The migration targets two of BSC’s four cryptographic layers: transaction signatures move from ECDSA to ML-DSA-44, and consensus vote aggregation switches from BLS12-381 to pqSTARK. This shift increases transaction size from 110 bytes to roughly 2.5 KB, causing block sizes at 2,000 TPS to reach ~2 MB (up from ~130 KB). Cross-region tests showed a 40–50% drop in throughput; however, median finality latency remained stable at 2 slots, with only the 99th percentile degrading due to larger block propagation. BNB Chain concludes that post-quantum migration is feasible but highlights scale constraints as the main challenge for production deployment.
Both initiatives signal a proactive stance as the industry acknowledges that quantum computing, while not yet an operational threat, demands long-term architectural preparation.
