30% of All Bitcoin Is Already Exposed to Quantum Attack: Report
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Glassnode finds 6.04 million Bitcoin (30.2% of supply) have public keys visible on-chain, meaning a sufficiently powerful quantum computer could target those coins now, and exchange custody exposure varies widely with Binance ~85% exposed versus Coinbase ~5%. Citi warns quantum computing timelines are compressing, heightening crypto security and custody risk and increasing urgency for migrations to quantum-resistant keys, protocol upgrades and stronger custody practices.
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- About 6.04 million Bitcoins, worth 30% of the supply, already have public keys visible on chain.
- Exchange custody varies widely, with Binance 85% exposed while Coinbase sits at just 5%.
- Citi also warns that quantum computing threat timelines are shrinking faster than expected.
A new analysis from Glassnode has quietly revealed something the crypto industry has been avoiding: 6.04 million Bitcoin, representing 30.2% of all issued supply, already has its public key visible on-chain. In simple terms, that means a sufficiently powerful quantum computer would not need to wait for those coins to move. It could target them right now.
Citi has added its own warning, flagging that quantum computing timelines are compressing faster than previously estimated, with breakthroughs in qubit stability and error correction bringing the threat closer than a decade-old defense plan a…
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