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Blockchain and Digital Identity

An identity is defined as a “set of attributes related to an entity” [ISO / IEC 24760–1]. If 2019 was cataloged as the beginning of a new digital identity and digital certificates, 2020 was the year of expansion and consolidation thanks to Blockchain technology.

It was difficult for users to control their own identity information in traditional digital identity based on centralized models (databases) or 3rd party identity providers (IDP) such as Facebook and Google. A new approach comes with the concept of sovereign identity based on Blockchain technology (DID) to return full control over your identity to users.

Blockchain technology enables the Self Sovereign model to work. In this model, the identity is managed directly and autonomously by the user. This system allows you to manage a root of trust without a central authority or a single point of failure. Therefore, blockchain solves problems that traditional models face, such as lack of control over identities and high costs for organizations.

Thanks to the blockchain, distributed systems without central dependency can work without affecting their security.

There are several cases in the world today about the use of decentralized digital identities in times of the COVID-19 pandemic. It has allowed us to keep the spread of the virus in control in some places, as an exemplary case of a combination of digital identities applied to the current health problem.

One of the first successes in this field is from PwC Italy that has been experimenting with a ‘Sovereign identity’ for the Italian market.

At the European level, there are several proposals in this regard. One of the cases that generated the most traction this year was the proposal for a digital passport with Blockchain technology in Spain to boost the tourism and aviation sector in coronavirus cases.

In Ibiza’s tourist region, the APP hi + Card’s launch was announced, supported by the World Tourism Organization “UNWTO” and adopted by IATA.

Moreover, Health iCard is a digital immunity passport that will allow its owner to move freely through the different checkpoints arranged worldwide by COVID-19.

The application comes with double encryption with the blockchain and with two-factor authentication for greater security, where medical records are stored and will allow travelers full control of their data at all times due to the encryption using the blockchain.

The use of the blockchain in digital identities not only goes through decentralized health passports; numerous other cases include from certifications of academic data to the experiment of identification documents that already can be displayed in some places in Southeast Asia.

Such is the case of Sendsquare, a company founded FLETA, joining in DID Alliance. Their members include recognized companies and institutions such as Samsung SDS, Raonsecure, Military Manpower Administration. Sendsquare will apply Omnione, a decentralized identifier service used by DID Alliance, to its platforms requiring DID service.

In this way, decentralized identities become one of the representative use cases of Blockchain technology that allows users to manage their information transparently.



FLETA is a blockchain platform that aims to offer infrastructure that can be applied to real-world business models. FLETA has its own core blockchain technologies like Level Tree Validation, Parallel Sharding, Independent multi-chain Structure, Block Redesign, and PoF(Proof-of-Formulation) which is its own consensus algorithm. With them, it aims to solve problems that existing platforms have such as slow speeds, scalability limitation, and excessive fees and provide a flexible development environment. Moreover, through its Gateway technology, it enhanced its interoperability by allowing projects issuing their tokens through other mainnets to maintain their mainnets while using FLETA chain.

Sendsquare, a foundation that developed FLETA project, was selected as one of the blockchain PoC support projects by the National IT Industry Promotion Agency (NIPA) of the South Korean Government since 2019 and has developed the blockchain-based on-chain clinical data management system (eCRF System) and RWD basic clinical research analysis report platform using blockchain technology.


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