# AmericanFortress researchers introduced a patent-pending post-quantum signature scheme.

*web3 · news · 2026-05-21 · CoinDesk*

## Key points

- AmericanFortress introduced a post-quantum signature scheme that avoids mass migrations for quantum resistance.
- The protocol allows dormant and Satoshi-era Pre-BIP32 bitcoin wallets to be protected via a soft fork freeze.
- Unlike existing solutions, AmericanFortress's approach maintains performance by natively integrating with existing cryptographic curves.
- Quantum-proofing can now be implemented through a simple wallet update, including for other major chains like Ethereum and Solana.
- AmericanFortress is licensing its SDK to blockchain projects and its Bitcoin solution will be ready for review before June 2.

**Companies:** AmericanFortress
**Countries:** United States, France

[Read the full story on CoinDesk](https://www.coindesk.com/tech/2026/05/21/satoshi-s-1-1m-bitcoin-stash-can-be-saved-from-quantum-attack-says-americanfortress)

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