Key Takeaways
- BNB Chain successfully tested post-quantum signatures while preserving full EVM compatibility.
- The migration came with steep trade-offs, including a roughly 40% decline in TPS and blocks growing nearly 18 times larger.
- Ethereum, Solana and other major blockchains are now actively preparing for a future shaped by quantum-resistant cryptography.
Quantum computing still feels distant to much of crypto.
But behind the scenes, major blockchains are already preparing for the possibility that one day, today’s cryptography may no longer be secure.
BNB Chain just became one of the latest networks to test what that future could actually look like.
In a newly published research report, BNB Chain detailed a large-scale stress test to explore how its network would function with post-quantum cryptography.
The results were encouraging in one sense: the network worked.
But the costs were impossible to ignore.
Transaction throughput fell sharply, block sizes exploded and latency increased under realistic global conditions.
The report ultimately showed that quantum resistance is technically achievable today — just not without major performance sacrifices.
BNB Chain Tests a Quantum-Resistant Future
The experiment’s core goal was straightforward.
Replace vulnerable cryptographic systems while maintaining full compatibility with the Ethereum Virtual Machine (EVM) for BNB Chain.
For transaction signatures, BNB Chain replaced the widely used ECDSA standard with ML-DSA-44, a post-quantum signature scheme standardized by NIST.
For validator consensus aggregation, the network swapped BLS12-381 signatures for pqSTARK aggregation.
The changes preserved wallet compatibility and existing address formats, meaning users would not need entirely new account structures.
But underneath the hood, the numbers changed dramatically.
- Public keys expanded from 64 bytes to 1,312 bytes.
- Signatures jumped from 65 bytes to roughly 2,420 bytes.
To support the changes, BNB Chain introduced a new transaction type alongside a dedicated precompile for key storage.
The network then tested the system under both single-region and cross-region validator setups to simulate real-world conditions.
The biggest issue quickly became obvious: data volume.
Bigger Signatures, Slower Network
Under post-quantum conditions, native transfer throughput dropped roughly 40%, falling from around 4,973 transactions per second to about 2,997 TPS in cross-region tests.
Gas throughput declined even further in some scenarios.
At the same time, blocks ballooned from roughly 130 KB to nearly 2 MB under equivalent transaction loads — an almost 18-fold increase driven primarily by the larger signatures.
Median finality remained relatively stable at two slots, but worst-case latency rose significantly as larger blocks took longer to propagate globally.
The report noted that raw bandwidth, not signature verification speed, became the dominant bottleneck.
The cryptography itself worked efficiently enough. The real challenge came from moving vastly larger amounts of transaction data across a decentralized validator network fast enough to maintain performance.
Mixed workloads showed slightly better resilience, but the trade-off remained severe enough to raise practical concerns around scalability, storage costs and validator accessibility.
Larger blocks could eventually place more pressure on smaller validators and increase hardware requirements across the network.
Why Quantum Computing Is Becoming a Blockchain Concern
Most major blockchains today rely heavily on elliptic-curve cryptography, including systems like ECDSA and BLS signatures.
Those cryptographic schemes are considered secure against classical computers. Quantum computers, however, introduce a theoretical threat.
Using Shor’s algorithm, sufficiently advanced quantum systems could potentially derive private keys from public keys far more efficiently than traditional machines.
No existing quantum computer can currently break blockchain cryptography in practice.
But recent advances have accelerated industry concern.
Google’s Willow chip, unveiled in late 2025, demonstrated a major leap in quantum error correction and simulation performance, renewing discussions around how quickly “cryptographically relevant quantum computers” could eventually emerge.
Some researchers now believe meaningful quantum threats could arrive within the next decade rather than several decades away.
That shift has pushed blockchain networks into preparation mode earlier than many expected.
Ethereum, Solana and Others Are Already Preparing
BNB Chain joins a wave of networks addressing this.
Ethereum leads with a dedicated Post-Quantum Security team (formed 2026), weekly interop devnets, and research across clients.
Solana developers, including teams behind Firedancer and Anza, have also tested alternative signature schemes such as Falcon.
Others include:
- Quantum Resistant Ledger (QRL): Built from the ground up with post-quantum signatures.
- QANplatform: Uses CRYSTALS-Dilithium natively.
- IOTA, Algorand, and Cardano: Exploring or researching PQC integrations.
- Even Bitcoin developers have begun discussing eventual migration paths, though conversations there remain slower and more fragmented.
The broader pattern is becoming increasingly clear: quantum preparedness is evolving into a long-term infrastructure priority across crypto.
BNB Chain’s Test Shows the Industry’s Next Big Trade-Off
BNB Chain’s report does not suggest an immediate emergency.
Current quantum hardware remains far from capable of breaking modern blockchain encryption at scale.
What the research does show, however, is that the industry now has a much clearer understanding of the engineering trade-offs ahead.
Quantum-resistant blockchains appear possible without abandoning existing ecosystems like Ethereum’s EVM.
But achieving that future may require major breakthroughs in compression, bandwidth optimization and signature aggregation to avoid crippling network performance.
For now, BNB Chain’s experiment offers something valuable: a realistic preview of what the next era of blockchain infrastructure could look like.
And increasingly, the biggest challenge may not be quantum computing itself — but how blockchains scale around it.
Prashant Jha is a seasoned crypto journalist based in Delhi, India, with a Bachelor’s Degree in Computer Science Engineering. Passionate about the evolving world of blockchain and cryptocurrencies, he has been a dedicated voice in the industry since 2018. Prashant’s expertise lies in regulatory reporting, where he unravels complex legal and financial developments with clarity and precision. Before joining CCN in 2024, he honed his craft at Cointelegraph, establishing himself as a trusted name in crypto journalism.
His coverage spans major industry events, including the high-profile collapses of FTX, Three Arrows Capital (3AC), and LUNA, offering readers insightful analyses of their regulatory and market implications. Prashant’s technical background enables him to bridge the gap between intricate blockchain technology and its real-world applications, making his work accessible to novices and experts.
Beyond his professional pursuits, Prashant is an avid music enthusiast, often exploring diverse genres to unwind. A sports lover, he has a particular passion for cricket and frequently engages in discussions about the game. His multifaceted interests and sharp journalistic instincts make him a valuable contributor to CCN, where he continues shaping the crypto landscape's narrative.
