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Quantum threat could risk 50% of Bitcoin supply

7/9/2026

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Summary

Story summary

Crypto firms are designing quantum-resistant upgrades because quantum computers threaten existing cryptography.
Google says quantum computers that can break encryption may appear by 2029, earlier than expected.
A June 2026 paper estimates 35% to possibly 50% of Bitcoin’s supply could be quantum-vulnerable.
Moody’s analyst warns a single quantum-related hack could crash prices, prompting Jefferies to cut its Bitcoin allocation by 10% in January.

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Story summary

Crypto firms are designing quantum-resistant upgrades because quantum computers threaten existing cryptography.
Google says quantum computers that can break encryption may appear by 2029, earlier than expected.
A June 2026 paper estimates 35% to possibly 50% of Bitcoin’s supply could be quantum-vulnerable.
Moody’s analyst warns a single quantum-related hack could crash prices, prompting Jefferies to cut its Bitcoin allocation by 10% in January.