The First Quantum-Resistant Blockchain and Signatures Strengthen Ueno Bank of Paraguay's Digital Operations
Ueno Bank, Paraguay's largest bank with over 2.2 million customers, announced that post-quantum document safeguarding would be implemented. Ueno Bank was the first bank to provide a quantum-safe solution at production scale using tamper-evident hybrid blockchain and quantum-resistant signatures, setting a new cybersecurity standard in the financial industry.
Quantum Risk to Financial Security
Increasing concerns about quantum computers' future threat prompted the program's creation. These complex gadgets may answer some problems tenfold quicker than regular computers using subatomic physics, which might threaten public-key approaches for digital signatures and encrypted traffic. Financial organisations are vulnerable to āharvest-now, decrypt-laterā attacks because they use audit trails, long-lived archives, and e-signatures.
National Institute of Standards and Technology (NIST) recommends quantum-resistant cryptography by 2030 to alleviate these risks. This precautionary approach reduces the potential of "time-travel attacks," in which malicious actors change and backdate digitally signed documents, weakening public faith in online banking.
Ueno Bank's Safe Quantum Architecture
In order to mitigate these risks, Ueno Bank is using SignQuantum, a post-quantum extension for e-signature processes, and QANplatform, a quantum-resistant layer-1 (L1) hybrid blockchain, to secure its documents. The single Latin American reseller of SignQuantum, ITTI, is supporting this deployment.
By adding quantum-resistant signatures to e-signature procedures, the bank's 2.2 million customers at 70 locations and 1,100 ATMs can trust paper documents. For internal assurance, Ueno Bank will cross-sign original documents and store their hashes on an on-premises permissioned QAN Private Blockchain using post-quantum cryptography.
For external verifiability and transparency, these hashes can be linked to a public QAN chain to create tamper-evident timestamps without a third party. ML-DSA-65, NIST's primary post-quantum signature standard, is supported by the QAN platform ledger and SignQuantum add-on, offering a clear alternative to elliptic-curve encryption.
A Strong Enterprise Foundation: QANplatform
Many features make QANplatform suitable for regulated financial situations. The multi-language smart-contract engine (QVM) supports Docker and Kubernetes, as well as popular Linux-compatible programming languages. For experimental projects and regulated workloads, the platform allows private or public QAN networks to be deployed on AWS, Microsoft Azure, or Google Cloud in under five minutes.
QAN's compatibility with Ethereum Virtual Machines (EVMs) makes it easier to move Ethereum-based applications like DEXs, NFTs, and DeFi to a quantum-resistant foundation with reduced resistance. It integrates with Chainlink and Band Protocol oracles and compensates authors with developer royalties.
QAN XLINK, ML-DSA-65 cross-signers, and hybrid deployment governance are proprietary components. The Linux Foundation's Post-Quantum Cryptography Alliance included QANplatform, one of its 20 founding members. An EU country deployed its technology in the public sector in 2024, bolstering its legitimacy.
New global finance standard
Ueno Bank's creative adoption is a paradigm for Latin American and global finance. Juan Manuel Gustale, President of Ueno Bank, said, āAdopting SignQuantum and QANplatformās technology both mitigates future risks and builds confidence with customers and partners to bring a new standard of cybersecurity in the financial sector.ā The bank is committed to innovation and security. Johann Polecsak, QANplatform's co-founder and CTO, discussed the platform's ability to protect and manage massive volumes of digital transactions and his excitement about its implementation in Ueno Bank. SignQuantum CEO Nazmath Nazeer is impressed by Ueno Bank's initiative and vision in adopting this technology initially.
Greater Industry Context and Outlook
A proposed āPost-Quantum Financial Infrastructure Frameworkā for markets and custody has been submitted to the US SEC, while the G7 Cyber Expert Group has advised industry to deploy quantum-resilient solutions quickly. This experiment shows how financial organisations may protect themselves from assaults and boost efficiency.
Latin America may follow Ueno's example: use post-quantum signatures, anchor proofs on an enterprise-ready L1 hybrid blockchain, and move beyond documents to high-value functions like identity and payments. In this cautious first step, Ueno Bank is protecting valuable papers and preparing for a larger quantum-safe transfer, ensuring the reliability and trustworthiness of modern financial systems.
