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BlackRock Flags Quantum Threat to $BTC and $ETH — 35% of Bitcoin Supply May Be Exposed

6/8/2026

BlackRock published a report this week warning that quantum computing poses a long-term cryptographic risk to $BTC and $ETH, putting institutional weight behind a debate the industry has largely treated as theoretical.

The firm's team — Robert Mitchnick, Head of Digital Assets; Will Su, Head of Digital Assets Research; and Inish Crisson, a senior software engineer in the Aladdin Digital Assets Lab — concluded the risk is manageable, but only if blockchains move fast enough.

At press time, $BTC traded at $62,629. What Actually Breaks — and What Doesn't The attack surface is narrower than headlines suggest.

Bitcoin's SHA-256 proof-of-work hash function is "largely considered quantum-resistant," with Grover's algorithm delivering only a quadratic speedup that the network's difficulty adjustment can absorb.

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