Quantum computers could hijack your cryptocurrency transactions in just a few minutes.
April 1, 2026
Original Paper
Securing Elliptic Curve Cryptocurrencies against Quantum Vulnerabilities: Resource Estimates and Mitigations
arXiv · 2603.28846
The Takeaway
New calculations show that a quantum computer with roughly half a million components could crack the encryption protecting major blockchains much faster than previously expected. This could allow attackers to steal funds by intercepting and altering public transactions while they are still waiting to be processed.
From the abstract
This whitepaper seeks to elucidate implications that the capabilities of developing quantum architectures have on blockchain vulnerabilities and mitigation strategies. First, we provide new resource estimates for breaking the 256-bit Elliptic Curve Discrete Logarithm Problem, the core of modern blockchain cryptography. We demonstrate that Shor's algorithm for this problem can execute with either <1200 logical qubits and <90 million Toffoli gates or <1450 logical qubits and <70 million Toffoli ga