Bitcoin and Ethereum Quantum Attack Costs Plummet

Researchers have made significant strides in optimizing quantum attack operations against Bitcoin and Ethereum. They reduced the resource estimate by 86%, bringing it below half of Google's previous benchmark. This improvement is crucial for both networks as they prepare to upgrade their cryptography.

The researchers focused on elliptic-curve cryptography, which underlies digital signatures used by major blockchains like Ethereum and Bitcoin. Breaking this encryption would allow an attacker to derive private keys and take control of exposed funds.

More than 100 researchers and developers participated in the challenge, including those connected to the Ethereum Foundation, Eigen Labs, and Trail of Bits. The optimization did not stop with the paper's cutoff; subsequent submissions pushed the number of Toffoli gates below 1 million, while another design reduced the logical-qubit requirement to 813.

The numbers are significant but do not mean researchers have demonstrated that Bitcoin or Ethereum can now be attacked. Circuits are theoretical components and do not include physical error-correction overhead required for a real quantum computer.