Recent research has brought attention to an emerging Bitcoin security question: which coins are currently exposed to quantum risk at rest? The relevant threshold is whether the public key needed to spend a coin is already visible on-chain. By that measure, 6.04M BTC, or 30.2% of issued supply, is exposed, while the remaining 13.99M BTC, or 69.8%, shows no public-key exposure at rest. These numbers are broadly in line with recently published work [1]. We separate this exposure into two categories. The first is structural exposure: outputs whose script type reveals the public key by design. The second is operational ... (full story)