Ueno Bank of Paraguay Strengthens Digital Operations with the First Quantum-Resistant Blockchain and Signatures in the World
The largest bank in Paraguay, Ueno Bank, which serves more than 2.2 million customers, has made a historic announcement about the implementation of post-quantum document protection. Ueno Bank has established a new benchmark for cybersecurity in the financial industry by being the first bank globally to implement a comprehensive quantum-safe solution at production scale through the strategic use of tamper-evident hybrid blockchain and quantum-resistant signatures.
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The Looming Quantum Threat to Financial Security
The program is being launched in the midst of growing worries about the threat that quantum computers will represent in the future. By using subatomic physics, these sophisticated devices may solve some problems tenfold faster than traditional computers, which could jeopardise the public-key techniques currently in use for digital signatures and encrypted traffic. Due to their heavy reliance on audit trails, long-lived archives, and e-signatures, financial institutions are especially susceptible to “harvest-now, decrypt-later” tactics, in which adversaries gather encrypted data now in order to use quantum technology to decrypt it later.
To reduce these concerns, the US National Institute of Standards and Technology (NIST) has called for the use of quantum-resistant cryptography by 2030. By taking this preventive measure, Ueno Bank mitigates the risk of “time-travel attacks,” in which malevolent actors could alter and backdate digitally signed documents, undermining public confidence in online banking.
Ueno Bank’s Quantum-Safe Architecture
In order to combat these risks, Ueno Bank is relying on SignQuantum, a post-quantum extension for current e-signature processes, and QANplatform, a quantum-resistant layer-1 (L1) hybrid blockchain, as the foundation for its new post-quantum document security. This implementation is being supported by the local technology company ITTI, which is SignQuantum’s sole reseller in Latin America.
The solution ensures the validity and integrity of papers for the bank’s 2.2 million customers across its 70 branches and 1,100 ATMs by superimposing quantum-resistant signatures on top of the current e-signature procedures. For internal assurance, Ueno Bank will use post-quantum cryptography to cross-sign original documents and store their hashes on an on-premises permissioned QAN Private Blockchain.
These hashes can also be attached to a public QAN chain for external verifiability and transparency, producing independently verifiable, tamper-evident timestamps that are independent of a third-party authority. The QAN platform ledger and the SignQuantum add-on both conform to ML-DSA-65, NIST’s primary post-quantum signature standard, providing a clear transition route away from the increasingly vulnerable elliptic-curve encryption.
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QANplatform: A Robust Foundation for Enterprise Needs
QANplatform is appropriate for regulated financial environments because of a number of important features. Developers may incorporate well-known, Linux-compatible programming languages and interface with well-known DevOps tools like Docker and Kubernetes its multi-language smart-contract engine (QVM). For pilot projects and regulated workloads, the platform facilitates rapid cloud deployment, allowing private or public QAN networks to be put up on major providers like AWS, Microsoft Azure, or Google Cloud in less than five minutes.
Importantly, the QAN platform is compatible with Ethereum Virtual Machines (EVMs), which makes it easier to migrate Ethereum-based applications, such as DEXs, NFTs, and DeFi, to a quantum-resistant foundation with reduced resistance. Additionally, it has a developer-royalty mechanism to compensate authors and interfaces with the Chainlink and Band Protocol oracles.
QAN XLINK, an ML-DSA-65 cross-signer, and governance for hybrid (public-and-private) deployments are examples of proprietary components. QANplatform was one of the original 20 members of the Linux Foundation’s Post-Quantum Cryptography Alliance and is a member of the Linux Foundation. Its legitimacy is further supported by the fact that an EU nation used its technology in the public sector in 2024.
Setting a New Standard for Global Finance
An important model for the Latin American financial industry and beyond is provided by Ueno Bank’s innovative adoption. “Adopting SignQuantum and QANplatform’s technology both mitigates future risks and builds confidence with the customers and partners to bring a new standard of cybersecurity in the financial sector,” said Juan Manuel Gustale, President of Ueno Bank, reaffirming the bank’s dedication to innovation and security. QANplatform’s co-founder and CTO, Johann Polecsak, highlighted the platform’s capacity to secure and manage high volumes of digital transactions and expressed excitement about seeing it implemented in a stable, real-world setting like Ueno Bank. As the first bank globally to adopt this technology, Ueno Bank has shown remarkable leadership and vision, according to Nazmath Nazeer, CEO of SignQuantum.
Broader Industry Context and Future Outlook
The US SEC has received a proposed “Post-Quantum Financial Infrastructure Framework” that outlines an orderly transition for markets and custody, while the G7 Cyber Expert Group has recommended for the prompt implementation of quantum-resilient solutions across industries. This project shows how financial institutions can improve operating efficiency and proactively defend themselves against potential attacks.
Ueno’s project provides a repeatable blueprint for Latin America: incorporate post-quantum signatures into current processes, anchor proofs on an enterprise-ready L1 hybrid blockchain, and move beyond documents to high-value tasks like identity and payments. By making this cautious initial move, Ueno Bank is safeguarding valuable documents today and laying the groundwork for a more extensive quantum-safe transfer, ensuring the dependability and credibility of contemporary financial systems.
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