New Quantum Shield Aims To Protect Existing Crypto Wallets

A Quantum Fix That Leaves Wallets Untouched

Blockchain security company AmericanFortress has unveiled a cryptographic scheme that it says could protect existing cryptocurrency wallets from future quantum attacks without requiring users to move funds, rotate keys, or change wallet addresses.

AmericanFortress released the technical paper for Zero-Knowledge Proof of Seed Provenance, or ZK-PoSP, through the International Association for Cryptologic Research's ePrint archive. The company describes the scheme as compatible with seed-based hierarchical deterministic wallets used across Bitcoin ($BTC), Ethereum ($ETH), Solana ($SOL), and other blockchain networks that rely on elliptic curve cryptography.

Rather than relying on traditional digital signatures alone, the scheme uses zero-knowledge proofs to verify ownership of the original wallet seed at the moment a transaction is signed. While a future quantum computer running Shor's algorithm could potentially derive a child private key from a publicly exposed address, it would still be unable to reconstruct the original master seed used to generate the wallet hierarchy.

The paper has not yet been peer-reviewed. The approach remains a proposal and would require node-level upgrades before any blockchain could enforce it. The paper says post-quantum security is "conjectured" because the underlying assumptions have not been tested against a cryptographically relevant quantum computer.

Why Quantum Risk Is Climbing the Agenda

Developers have increasingly focused on post-quantum cryptography because sufficiently powerful quantum computers could eventually break the elliptic-curve cryptography used to secure Bitcoin, Ethereum, and many other blockchain networks. The concern is gaining urgency. Google researchers have reported that breaking the cryptographic systems underpinning most cryptocurrencies could require significantly fewer quantum resources than previously estimated, with improved methods for compiling quantum algorithms reducing the scale of hardware needed to compromise elliptic curve cryptography.

Researchers estimate that an estimated 6.9 million $BTC tied to early wallets and reused addresses could be at longer-term risk. In recent months, a Strategy-led consortium pledged $15 million to fund Bitcoin quantum security research, the Ethereum Foundation published a proposal for migrating accounts to quantum-resistant cryptography, and Algorand outlined plans to introduce quantum-resistant accounts by 2027.

The AmericanFortress proposal stands out because most competing approaches require users to migrate assets to new addresses. According to the researchers, the only wallets that cannot benefit from the proposed approach are those created without hierarchical deterministic derivation schemes, including certain early Bitcoin wallets. The technical paper is now public, but independent peer review will be the next critical test of whether the scheme holds up under scrutiny.

Sources:
CoinTelegraph: AmericanFortress Unveils Quantum-Safe Crypto Wallet Proposal
Crypto.news: AmericanFortress Proposes Quantum-Safe Crypto Wallet Scheme
Google Quantum AI: Securing Elliptic Curve Cryptocurrencies Against Quantum Vulnerabilities