AmericanFortress, a privacy-focused blockchain startup, has announced the launch of a patent-pending quantum-resistant signature scheme designed to protect existing assets on Bitcoin, Ethereum, Solana, and Tron from future quantum computing threats. The scheme aims to secure these assets without requiring large-scale fund migrations. The proposed solution involves a compatibility soft fork and zero-knowledge proof mechanism to implement a 'defensive freeze' on Pre-BIP32 Bitcoin addresses from the Satoshi Nakamoto era. This includes approximately 1.1 million BTC in Satoshi's wallet and around 5 million long-dormant BTC. The community will later decide whether to move, destroy, or reallocate these assets.