Glassnode data indicates that potential Bitcoin exposure to quantum computing (advanced computational technology) risk is centered on major exchange wallets rather than being evenly spread across the network. The finding suggests that a relatively small number of large custodial addresses could represent the most significant concentration of vulnerability if future quantum systems are able to compromise the cryptographic methods used to secure Bitcoin holdings. In practical terms, exchange wallets often hold large balances on behalf of many users, making them a focal point in any discussion about long-term cryptographic security in the Bitcoin ecosystem.