A research note published in the news this week by City warns Recent developments in quantum computing have compressed the practical attack timeline for digital asset crypto as early as 2030-2032, with Bitcoin identified as more vulnerable than Ethereum, not due to technical design alone, but due to a governance gap that would make rapid crypto migration extremely difficult on the Bitcoin network.
The report highlights Ethereum’s long-standing history of protocol upgrades – what Citi analysts describe as a “hard fork culture” – as a structural security advantage when evaluating long-term resilience against quantum attacks.
says City $ Bitcoin It faces a massive quantum threat as computing breakthroughs accelerate. FUD is predictable. Quantum is years away from impacting current crypto security. The market has bigger and more pressing concerns. This is just noise.
– Kris Sato (@kris_nakamoto) May 19, 2026
Citi’s memo arrives as Google’s quantum hardware roadmap continues to tighten its timelines: Google researchers estimated that a machine with a capacity of 500,000 qubits could break the current elliptic curve cipher in just minutes.with a Q-Day target of 2032, although some independent researchers place this threshold as early as 2030.
None of these machines exist today, but the path is no longer a matter of theoretical debate.
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Shor’s Algorithm and ECDSA: What the Quantum Threat to Blockchain Security Actually Represents
The mechanism works as follows: Both Bitcoin and Ethereum secure user funds using ECDSA (Elliptic Curve Digital Signature Algorithm), a cryptographic scheme whose security is based on the computational difficulty of deriving a private key from a visible public key.
Classical computers cannot solve this problem in any practical time frame; the mathematics involved would require more operations than current machines can perform in the lifetime of the universe. However, a sufficiently powerful quantum computer running Shor’s algorithm reduces this problem to polynomial time, meaning that deriving the private key from the public key becomes computationally tractable.
Exposure is not uniform across all portfolio types. Public keys are only revealed when a transaction is broadcast, but that window between broadcast and confirmation is itself a vulnerability: a quantum attacker operating within that window could theoretically derive a private key and redirect funds before the original transaction has finished. Most importantly, wallets that have previously made transactions already have their public keys permanently visible on-chain.
BSC passed quantum upgrade test, but TPS decreased by 40%
BNB Chain released BSC’s post-quantum crypto migration report, saying that BSC has tested a post-quantum upgrade using ML-DSA-44 for transaction signatures and pqSTARK for consensus vote aggregation. The design remains… pic.twitter.com/WKDKIwBanX
— Wu Blockchain (@WuBlockchain) May 19, 2026
According to a Citi analysis, an estimated 6.7 to 7 million bitcoins reside in wallets where public keys are already exposed, representing a concentrated and immutable target. Of those coins, nearly 1 million bitcoins believed to have been mined by the pseudonym Satoshi Nakamoto remain in early address formats that are particularly vulnerable, valued at around $82 billion at current prices. The binding coding assumption at risk is discrete logarithm rigidity on elliptic curves.
Once a cryptographically relevant quantum computer (CRQC) exceeds an error-correcting threshold and enough qubits to run Shor’s algorithm against 256-bit curves, this assumption fails completely.
Ethereum News: Ethereum’s hard fork culture, structural governance advantage over Bitcoin
What distinguishes Ethereum News in Citi Analysis is not its current cryptographic design; Ethereum uses ECDSA and is technically vulnerable to the same Shor algorithm attack vector as Bitcoin. The difference is the speed of governance: the Ethereum developer community and stakeholder base have repeatedly demonstrated an ability to coordinate and implement disruptive protocol changes on relatively compressed timelines.
The merger in September 2022 moved the entire network from proof-of-work to proof-of-stake – a change in scope similar to any proposed post-quantum cryptography (PQC) migration, without splitting the chain. EIP-1559, the Dencun upgrade, and the upcoming Pectra hard fork all represent coordinated, multi-client changes to the protocol implemented through the same management mechanism that would be required for quantum-resistant migration.
🧵 Prediction: Ethereum will be pushed forward by a hastily designed and implemented “quantum-resistant” hard fork because they are desperate for a new narrative that will stop the bleeding against Bitcoin.
This will be promoted by Coinbase.eth and each VC portfolio holder, accompanied by…
– Bit Paine ⚡️ (@BitPaine) January 25, 2026
Vitalik Buterin addressed the issue of quantum preparedness directly, writing that if quantum computers approach the ECDSA breakout threshold, Ethereum likely has years of advance warning and could “hard fork new signature schemes” during that window.
Ethereum Foundation researchers have discussed PQC migration paths that leverage account abstraction, specifically ERC-4337 compatible smart contract wallets, to enable hybrid key schemes where users hold both ECDSA and quantum-resistant keys and rotate to PQC signatures across a contract wallet without requiring users to manually manage key migration.
NIST’s selection of CRYSTALS-Dilithium as a lattice-based signature standard provides a concrete candidate algorithm for such a relay. This is not a speculative road map. It is an engineering path with specific components, governance precedent, and institutional validation that now comes from Citi Research.
Bitcoin’s position is structurally different. Bitcoin’s conservative consensus model presents significant obstacles to the rapid protocol changes that quantum readiness requires.
BIP-360 and BIP-361 have been flagged by Citi analysts as proposed upgrades to watch, but neither has reached the consensus stage. Speaking at the Financial Times Digital Asset Summit, Fireblocks CEO Michael Shawlov described Bitcoin’s quantum challenge as “mostly a coordination issue, acknowledging that algorithms exist but social coordination and governance remain the binding constraint.” Although this framing is meant to be reassuring, it is precisely the source of Citi’s concern.
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Neil is a professional cryptocurrency content writer with years of experience. He has written for numerous cryptocurrency websites to report breaking news, and has been hired by all kinds of cryptocurrency projects, to create content that will increase their exposure and attract more potential investors.
