About 6.04 million Bitcoin — 30% of all coins in circulation — have their public cryptographic keys visible on-chain, putting roughly $500 billion in holdings at theoretical risk from quantum computing. The exposure splits into two buckets: 1.92 million BTC from structural legacy outputs (early Satoshi-era coins, Taproot) and 4.12 million BTC from operational address reuse. The finding comes as Bitcoin trades below $80,000 and as an on-chain analyst says the bottom might be forming.
Structural vs. operational exposure
The exposed coins aren't all equally dangerous. Structural exposure covers old pay-to-public-key outputs and Taproot addresses — coins that were never moved after a specific protocol upgrade. Operational exposure is more common: it's caused by address reuse, where a spender reveals their public key during a transaction and then leaves funds sitting at that same address. Together, these categories represent a broad target set. If an attacker ever runs Shor's algorithm at scale, they could theoretically derive private keys from those public keys.
The quantum threat — real but distant
Shor's algorithm is a theoretical method for factoring large numbers quickly, which would break elliptic-curve cryptography — the foundation of Bitcoin's security. No quantum computer today can run Shor on a meaningful key. But the exposed coins could become vulnerable if and when that changes. That's not an immediate crisis, but it's a long-term liability that the network's design hasn't addressed yet.
Market conditions: bottom call and ETF flows
Bitcoin is below $80,000, with support at $74,000 and resistance at $78,000. ETF inflows are starting to return, which on-chain analyst Willy Woo called the most important variable for stabilizing spot demand. Woo said Bitcoin is "currently attempting a bottom" and that the next three to six weeks are decisive. The price action hasn't confirmed a rebound yet, but the flow picture is improving.
Bitcoin Hyper raises $32M in presale
Separately, Bitcoin Hyper — a Bitcoin Layer 2 that integrates the Solana Virtual Machine — raised over $32 million in its presale. The token is trading at $0.0136, with staking offering 36% APY. The raise shows there's still appetite for Bitcoin-scalability bets even as the base layer faces structural questions about its future security posture.
