CoinDesk
Binance's BNB Chain completed a proof-of-concept that replaced its two core cryptographic systems — ECDSA transaction signatures and BLS12-381 validator vote signatures — with quantum-resistant alternatives. The cryptography held, but cross-region native-transfer throughput fell from 4,973 transactions per second to 2,997, a roughly 40% drop, as much larger signatures pushed significantly more data across the network.
A typical transaction grew from about 110 bytes to roughly 2.5 kilobytes, while block sizes expanded from around 130 KB to about 2 MB. The bottleneck was not verification; it was moving the extra data.
Why it matters
BSC is one of the largest Ethereum-compatible chains by transaction volume, making it a useful real-world test case for whether high-throughput networks can absorb a post-quantum security upgrade without losing their speed advantage. The test shows the technical swap is viable — validator vote signatures held up because BSC found an efficient way to compress them. Ordinary user transactions did not: every payment now carries a much larger quantum-resistant signature, and that data load is what drags throughput down.
The result reframes the quantum-prep debate. The question is no longer whether blockchains can be made quantum-resistant, but how much speed and efficiency networks are willing to trade away to get there.
Market impact
Bitcoin, Ethereum and TRON are each pursuing different paths to post-quantum security, which means no industry-wide standard is in sight. Bitcoin developers are weighing longer-term protocol upgrades such as BIP-360, while separate researchers have floated emergency workarounds that would function under today's rules at significantly higher per-transaction cost. The Ethereum Foundation has launched a dedicated post-quantum initiative aimed at gradually upgrading wallets and validator infrastructure over several years. TRON is moving fastest — founder Justin Sun has said the protocol will launch a quantum-resistant testnet in Q2, followed by a mainnet rollout in Q3, positioning TRON to potentially be the first major chain marketed as quantum-safe.
Frequently asked questions
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What did BSC actually test?
BSC replaced ECDSA transaction signatures and BLS12-381 validator vote signatures with quantum-resistant alternatives in a proof-of-concept, then measured throughput and data load across the network.
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How big was the throughput drop?
Cross-region native-transfer throughput fell from 4,973 transactions per second to 2,997 — roughly a 40% drop — as larger signatures added more data per transaction.
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Why did transactions get slower?
Because the data got bigger. A typical transaction grew from about 110 bytes to 2.5 KB, and block sizes expanded from around 130 KB to about 2 MB. The verification itself worked; moving the extra data was the bottleneck.
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Which part of the network held up best?
Validator vote signatures held up because BSC found an efficient way to compress them. The bigger strain came from ordinary user transactions, where every payment had to carry a much larger quantum-resistant signature.
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How are other major chains approaching post-quantum security?
Bitcoin developers are weighing BIP-360 and emergency workarounds. The Ethereum Foundation has launched a multi-year post-quantum initiative. TRON says it will launch a quantum-resistant testnet in Q2 and a mainnet in Q3, making it the most aggressive of the three.
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