Security· ★★★★· bearish·

Quantum Alliance flags 6.04 million bitcoin with exposed public keys

  • —Founding members include Quantus, Postquant Labs, Midnight Foundation, Keystone, Abelian and Hacken
  • —The 6.04 million BTC figure is an upper bound; some 2009-era coins are likely lost forever
  • —A public key is exposed on first spend, and address reuse keeps it exposed permanently
  • —Google Quantum AI cut its March 2026 estimate to under 500,000 physical qubits
Why it matters: Migration to post-quantum signatures will hit exchanges, custodians and wallet makers, not just the Bitcoin protocol.
#BTC
Source: CryptoTicker
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