AmericanFortress has published a preprint introducing the ZKPoSP cryptographic scheme designed to protect hierarchically deterministic wallets from potential quantum attacks without having to change existing addresses. According to the proposed architecture, the classical digital signature is replaced by a non-interactive zero-knowledge proof (NIZK), which allows one party to confirm ownership of information without directly disclosing it to the verifying party. Additionally, the developers described the QBIP32 scheme, which generates a signature scalar, a quantum-stable certificate, and a chain code within a single function call. This technology is applicable to various elliptic curves of simple order, including secp256k1 and Ed25519, providing high flexibility of potential implementation.

The proposed constructions are implemented in the Rust programming language using the RISC Zero platform. According to the authors, the process of creating a signature proof takes approximately twelve to thirteen seconds, while the verification procedure requires only nine to ten milliseconds. Despite the claimed post-quantum stability based on the reliability of hash functions and NIZK proofs, the practical application of the scheme requires significant modifications at the level of the underlying protocols. Currently, leading blockchain networks, including Bitcoin, Ethereum and Solana, do not support native verification of such evidence instead of standard cryptographic signatures, which makes their mass adoption a matter of the distant future.

The presented development is part of a large-scale industry initiative to neutralize quantum threats. Earlier, Galaxy analysts estimated that about seven million bitcoins in addresses with disclosed public keys could be potentially vulnerable. In response to these challenges, leading market participants, including BlackRock, Coinbase, and Strategy, announced the creation of the Bitcoin Security Consortium with a budget of fifteen million dollars for research in the field of post-crypto. At the same time, Freedom Factory and the Stellar Development Foundation presented their own hardware and software solutions aimed at ensuring the long-term security of digital assets without the need for radical network updates.