Overview
- Bernstein’s note and new comments from Blockstream CEO Adam Back on Wednesday said quantum computers do not pose an immediate threat to Bitcoin and called for a planned transition rather than a rush.
- Google Quantum AI’s recent paper cut resource estimates for breaking elliptic‑curve signatures to under 500,000 physical qubits and highlighted a minutes‑long “on‑spend” window where a broadcast transaction’s public key can be used to steal funds before confirmation.
- Grayscale said the main hurdle is governance, not engineering, pointing to about 6.9 million BTC with public keys already exposed on-chain and raising community choices such as doing nothing, slowing spend rates, or burning those coins.
- Post‑quantum tools exist today and are being trialed, with NIST standards finalized in 2024, experiments on Solana and the XRP Ledger, and Blockstream using Liquid as a testbed, while proposals like BIP‑360 aim to keep public keys off‑chain.
- Fresh academic work argues quantum computers are unlikely to upend Bitcoin mining, shifting focus to wallet signatures and practical trade‑offs users will feel during migration, such as larger signatures that can slow networks and the need to rotate keys.