Argentina's national medical transplant authority, INCUCAI, has deployed decentralized digital identities and blockchain-based document verification across its organ and tissue transplant network, representing a significant expansion of distributed ledger technology into the country's public healthcare infrastructure.

Argentina operates one of Latin America's most active organ donation and transplant systems, governed under a presumed-consent legal framework established by the 2018 Ley Justina. INCUCAI coordinates that national system, overseeing procurement, allocation, and oversight across provincial procurement organizations and hospital-based transplant teams.

The system, developed by technology firm Extrimian, provides participating agencies with verifiable digital identities registered on the IOTA Mainnet. INCUCAI retains its role as the central governing authority under the framework, continuing to grant, suspend, and restore accreditation for agencies involved in the transplant process.

The initiative aims to strengthen the integrity, traceability, and legal reliability of critical transplant procedures while safeguarding sensitive patient information.

IOTA Identity Framework and Off-Chain Data Design

The deployment leverages IOTA Identity, which delivers decentralized identifiers and verifiable credentials built on standards established by the World Wide Web Consortium (W3C). The framework supports digital identities for individuals, organizations, and devices, combining self-sovereign identity technology with verifiable credentials and cryptographic proofs recorded on a public ledger.

IOTA released the identity framework in alpha last year. Its architecture keeps credential information off-chain while recording cryptographic evidence on the public ledger, enabling verification of documents and identities without exposing confidential data on the decentralized network.

Blockchain Proofs Without On-Chain Medical Records

INCUCAI has linked its decentralized identifier to its official government domain, allowing users to confirm that the digital identity presented through IOTA genuinely belongs to Argentina's national transplant authority.

Daniela Hansen Krogh, INCUCAI's director of Information Technology and Information Systems, said the integration of decentralized identity and cryptographic verification is expected to enhance the security and traceability of key procedures while preserving the confidentiality of sensitive medical data.

Authorized participants can electronically sign documents and generate a cryptographic fingerprint — known as a hash — that is recorded on IOTA. The hash can then be used to verify whether a document has remained unaltered since it was signed and notarized. Patient records and medical documents stay off-chain; IOTA stores only the cryptographic proofs that allow authorized parties to confirm document integrity without revealing confidential health information.

The off-chain design also aligns with health data protection obligations under Argentina's Personal Data Protection Law (Law 25.326), which restricts how sensitive personal information, including health records, may be processed and disclosed.

The system can demonstrate that a document was not modified after notarization. However, it cannot verify whether the medical information entered into a document was accurate at the time of submission. Responsibility for the accuracy of medical content continues to rest with healthcare professionals, accredited agencies, and the procedures governing the transplant system.

Digital Wallet and Fee-Sponsored Infrastructure

The initiative introduces IncucaiID, a digital wallet designed for patients, healthcare professionals, and other authorized participants. The wallet enables users to receive verifiable credentials, establish their digital identity, and electronically sign documents associated with organ donation and transplant procedures.

IOTA's Gas Station system covers the network costs associated with recording cryptographic proofs, meaning users are not required to acquire IOTA tokens or manage transaction fees. The fee-sponsored infrastructure allows healthcare participants to utilize blockchain-based verification tools without handling digital assets or paying network costs.

Dominik Schiener, co-founder and chairman of the IOTA Foundation, stated that the deployment demonstrates how open blockchain technology can support critical public services at a national scale. He noted that the infrastructure is already being applied to processes involving decisions with significant consequences for patients.

Phased Rollout Across SINTRA

The operational rollout began in June and will proceed in stages. The first phase focuses on registration for heart and lung transplant waiting lists. The system will subsequently be extended to additional transplant waiting lists and other processes within SINTRA, Argentina's national transplant information system.

The deployment reflects a broader effort to apply decentralized identity and cryptographic verification to public healthcare administration while maintaining institutional oversight and keeping sensitive medical information off the blockchain. Government use of blockchain-based identity and document verification has been explored in several countries, including Estonia's e-governance infrastructure and European Union initiatives around the European Blockchain Services Infrastructure, making Argentina's INCUCAI deployment a notable Latin American case of distributed ledger technology applied to a live, safety-critical medical process.