2026.04.11 01:59:21 (Mastodon 116383597279511978, Twitter 2042784550015697290) from Daniel J. Bernstein:
Corrected numbers (tnx PLDD): https://arxiv.org/abs/2603.28846 estimates 2^19 qubits, 1/3 hour, to break an ECC key. https://arxiv.org/abs/2304.14344 estimates 6 watts/qubit. 2^20 watt-hours costs $100 in electricity + hardware-building cost. More analysis can change numbers in either direction.