Debate over draft BIP-361 expanded after Blockstream CEO Adam Back said at Paris Blockchain Week that Bitcoin should pursue an optional quantum-resistant upgrade rather than freezing unmigrated holdings. The latest report says about 6.9 million BTC could be at risk, including roughly 1 million BTC linked to Satoshi Nakamoto and 5.6 million long-dormant BTC. This contrasts with BIP-361, a soft fork proposal updated on April 15 that would phase out quantum-vulnerable addresses over five years and freeze coins that are not migrated. The dispute centers on whether Bitcoin should mitigate potential future quantum threats through voluntary migration or enforce stricter protocol-level restrictions on older address types.