Ueno Bank, Paraguay’s largest financial institution with over 2.2 million users, has introduced post-quantum document protection by deploying QANplatform, a hybrid blockchain resistant to quantum computing threats. The move positions the bank among the earliest adopters of quantum-secure cryptography in global finance, ahead of the 2030 timeline recommended by the U.S. National Institute of Standards and Technology (NIST).
Industry observers highlighted that quantum computers could one day compromise traditional cryptographic systems used by banks, insurance firms, and government agencies. NIST has advised early adoption of quantum-resistant technologies to mitigate these risks. Ueno Bank’s transition is seen as a strategic step to safeguard critical financial records and maintain customer confidence in an evolving threat environment.
How the system works
The bank’s solution relies on post-quantum cryptography to digitally sign original documents and store their cryptographic hashes on a locally deployed private version of the QAN blockchain. This ensures internal protection within its infrastructure. For transparency and external validation, these hashes can also be anchored to the QAN public chain, creating immutable, independently verifiable timestamps resistant to tampering.
Executives at Ueno Bank explained that their institution has always positioned itself as both innovative and security-driven, with the adoption of cutting-edge technology viewed as a way to reinforce customer trust.
The QANplatform advantage
QANplatform offers several technical features that make it suitable for financial institutions. Its QAN Virtual Machine (QVM) allows developers to build smart contracts in widely used Linux-compatible programming languages, while also supporting integration with modern DevOps tools such as Docker and Kubernetes. The platform enables the rapid launch of private or public networks on cloud providers including AWS, Microsoft Azure, and Google Cloud in under five minutes. This flexibility makes it viable for regulated workloads, pilot projects, and full-scale deployments.
One of its most notable strengths is compatibility with the Ethereum Virtual Machine (EVM), which allows projects built on Ethereum—including decentralized exchanges, NFTs, and DeFi platforms—to migrate to a quantum-resistant environment with minimal disruption. The system also integrates with Chainlink and Band Protocol oracles and introduces a rewards mechanism to encourage developers to reuse and interact with smart contracts on its public chain.
QANplatform further supports security through components such as QAN XLINK, a cross-signing device based on ML-DSA-65 standards, and a hybrid deployment management system. The platform is part of the Linux Foundation and an early member of its Post-Quantum Cryptography Alliance. In 2024, its technology was deployed in the public sector of a European Union country, underscoring its credibility and practical applicability.
Model for the region
For Latin America’s financial services industry, Ueno Bank’s initiative is expected to serve as a blueprint. By incorporating post-quantum signatures into existing workflows, anchoring proofs on a corporate-grade hybrid Layer-1 blockchain, and extending use cases from document protection to identity verification, payments, and other critical services, the project sets a replicable model for regional adoption.
Analysts suggested that this deployment demonstrates how financial institutions can take proactive steps to protect themselves against future threats while enhancing operational efficiency. As the sector gradually approaches a post-quantum future, Ueno Bank’s adoption of QANplatform highlights how innovation in blockchain and cryptography can merge to secure the trust and resilience of modern banking systems.