Bitcoin Quantum Risk: 6 Million BTC Exposed — Where Does It Come From?
Recent industry research has zeroed in on a new security question for Bitcoin: which coins are actually exposed to quantum risk right now, in their current holding state? The core test is whether the public key needed to spend a coin has already been revealed on-chain. By that measure, roughly 6.04 million BTC — 30.2% of total issuance — currently sit behind public keys that are already visible on-chain [1]. The remaining 13.99 million BTC (69.8%) keep their public keys hidden while dormant, and are not exposed under this model. (A subsequent update from the same researcher on October 8 later revised the exposed figure to 6.26 million BTC, or 31.2% of supply [2].) ...