Circle Sounds the Alarm as Quantum Computing Narrows the Gap to Blockchain Security
TL;DR:
- The theoretical threshold to break ECDSA cryptographic signatures dropped from 2,330 logical qubits in 2017 to 813 logical qubits in August 2026.
- Google reached a milestone of 105 logical qubits with its Willow processor, while QuEra projects surpassing 1,000 logical qubits by 2029.
- Circle’s Arc network implemented support for the SLH-DSA post-quantum scheme standardized by NIST, maintaining hybrid compatibility with ECDSA.
This Monday, August 31, Circle warned that quantum computing narrows the gap to blockchain security faster than projected. The firm unveiled a technical monitoring tool after recording a 65% decrease in the computational requirements needed to breach the digital signature schemes predominant across the industry.
The cryptography protecting most blockchain transactions is getting easier to break.
That does not mean quantum computers are a threat yet. It means the gap between today’s quantum capability and the defenses securing blockchain signatures is getting smaller.
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