AmericanFortress, a company developing a universal privacy layer for blockchain, announced it has closed an $8 million seed funding round co-led by SAVA Digital Asset Fund, Moon Pursuit Capital, and 0G Labs.
Alongside the funding, the company has filed a patent for quantum-resistant cryptographic transaction signing.
The announcement comes amid growing concerns around the security of blockchain cryptography, as timelines for potential quantum threats appear to be accelerating.
Grayscale Research has called for faster efforts to make public blockchains quantum-resistant, highlighting that decentralized governance — particularly decisions around millions of already-exposed legacy wallets — remains a key challenge.
At 0G, we’re building the foundational infrastructure for an AI-native economy and that infrastructure must be secure against threats that don’t yet exist at scale but will. AmericanFortress has solved how to make blockchain transactions genuinely quantum-resistant without sacrificing usability, compliance, or privacy. Co-leading their seed round reflects our conviction that post-quantum security isn’t a future feature, but a present necessity. 0G is proud to be the first chain to bring this technology to production.
The quantum threat
All major blockchains — including Bitcoin, Ethereum, and the networks built on top of them — rely on elliptic curve cryptography (ECC) to secure wallets and authorize transactions.
ECC is considered secure because the underlying mathematical problems are infeasible for classical computers to solve.
However, a sufficiently advanced quantum computer running Shor’s algorithm could change that, enabling the derivation of private keys from public keys and potentially allowing attackers to access wallets whose public keys have appeared on-chain — which includes most active wallets.
The quantum threat to blockchain is increasingly viewed as a near-term risk rather than a theoretical one.
Google has recently published research highlighting vulnerabilities in existing cryptographic systems, while initiatives such as Circle’s Arc are working to implement post-quantum protections.
The plan to tackle the threat
The patent filing aims to address this risk. Its quantum-resistant public derivation scheme is designed to be compatible with quantum-proof signatures.
The company plans to license this technology to other blockchains as a retrofit solution, positioning it as relatively straightforward to implement.
Under this model, Send-to-Name™ transactions would be quantum-safe end-to-end, and any blockchain adopting the system could achieve quantum-resistant security for both users and AI agents.
We invented Send-to-Name™ to make crypto as easy and safe as sending a Venmo. Now, with this patent filing, we’re adding a layer of security that protects every transaction against the quantum threat horizon. We’re proud to be the first naming and privacy infrastructure to file for post-quantum transaction signing. Together with 0G, we’re building the infrastructure that the next generation of digital finance actually needs.
AmericanFortress said it has built a unified privacy infrastructure for blockchain transactions, combining human-readable names, stealth address privacy, zero-knowledge balance confidentiality, built-in compliance, and post-quantum security into a single system designed to work across supported chains.
The company said the $8 million seed round will be used to accelerate production deployment of its privacy infrastructure and support the planned $AF token generation event, targeted for Q2 2026.
