The prospect of quantum computers breaking today’s cryptographic defenses is raising urgent concerns among blockchain security experts. Analysts believe that the first indication of quantum-powered breaches may not be high-profile thefts, but a series of unexplained breaches targeting multiple crypto wallets at once.
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Quantus Network CEO and co-founder Christopher Smith warned that a sufficiently advanced quantum computer could derive private keys from public ones exposed on blockchain networks. This capability would allow attackers to move funds without infiltrating wallets, devices, or exchange infrastructures. Smith noted that in such events, there would be no discernible traces of how the breach occurred: only the fact that funds had been withdrawn.
His warning follows significant progress in quantum algorithms, which have recently reduced the estimated computational resources necessary to attack elliptic-curve cryptography—a mechanism widely used by leading blockchains for security.
Quantum computing refers to a new paradigm in computation, leveraging quantum bits (qubits) to solve certain problems much faster than classical computers.
Mini dictionary: Elliptic-curve cryptography is a method of encrypting data that relies on the mathematics of elliptic curves, widely used for its efficiency in securing digital transactions and communications.
Potential quantum targets in crypto
While much of the crypto community’s concern centers on the fate of Satoshi Nakamoto’s untouched Bitcoin—valued at $63 billion—Smith suggested that more attractive targets could be found elsewhere. He identified administrative keys for multi-chain stablecoins such as Tether’s USDT as especially valuable. According to Smith, a successful quantum attack on such administrative wallets could enable malicious actors to rapidly mint new tokens and flood the market before issuers had time to react.
Tether, the company behind USDT, manages the world’s largest stablecoin, which operates across several blockchains. Some of these networks have already taken initial steps to prepare for a post-quantum cryptography era.
Security researcher Sean Cheetham from Blockchain Capital predicted that attackers might avoid high-visibility targets and instead quietly access exchange “hot wallets,” which routinely handle user funds and are often linked to public keys.
Smith emphasized that an attacker could disguise a quantum theft as a standard compromise, providing alternative explanations such as a lost key, thus delaying detection.
Cheetham explained that such incidents would appear ordinary, as the true method of compromise would remain undetected under current investigative techniques.
Timeline for quantum risk
Recent advances in artificial intelligence are accelerating the potential impact of quantum computing. In March, Google pushed up its post-quantum transition plans to 2029, following an AI-assisted breakthrough indicating that cracking elliptic curve cryptography could require fewer qubits than previously anticipated.
Roy Blackstone, CEO of crypto security firm NGRAVE, remarked that earlier quantum risk assessments did not anticipate such rapid progress in AI and quantum algorithm research.
Despite these developments, estimates for when a quantum computer will be capable of breaking cryptographic protections remain highly variable. Smith, who leads Quantus Network, said there is a “50-50” chance this milestone could be reached by 2028, given the current pace of research.
Cheetham forecasted that the early 2030s were almost a certainty for the arrival of this technology, though he acknowledged an earlier breakthrough remains possible. Michael Coates, chief information security officer at the Solana Foundation, declined to offer a timeline, stating that uncertainty prevails and the timeframe has constantly shifted.
Blackstone observed that despite disagreements over timing, major blockchain networks are already preparing for post-quantum migration. He warned that failure to do so could have disastrous consequences.
