The digital Republic of Estonia’s KSI system & public ledger.

Estonia is known for being a digital republic that has implemented blockchain technology to secure its systems.

The technology chosen for Estonian systems is KSI Blockchain, which is also used by NATO and the U.S. Department of Defense.

Data never leaves the system; only hash is sent to blockchain service.

As no data is stored on the KSI Blockchain, it can scale to provide immutability for petabytes of data, every second.

This distributed ledger gives citizens and residents more control over their own data.

Estonia’s national system stores every citizen’s medical data in the cloud, kept secure by blockchain technology, and readily accessible for the individual and their care providers.

KSI, or Keyless Signature Infrastructure, is a blockchain technology that provides a secure and transparent way to validate data and transactions.

Unlike other blockchain technologies that rely on public and private keys to authenticate transactions, KSI blockchain uses a hash-based algorithm to sign digital content.

KSI Blockchain was first developed in 2008 for the Government of Estonia to secure its critical health, justice, and business data.

Since then, it has been deployed by the world’s most demanding customers, including numerous governments and leading companies in telecoms, aerospace, defense, energy, financial services, and insurance.

KSI Blockchain is designed to ensure networks, systems, and data are free of compromise while retaining 100% data privacy.

With KSI Blockchain deployed in Estonian government networks, history cannot be rewritten by anybody and the authenticity of the electronic data can be mathematically proven.

It means that nobody – neither hackers nor system administrators nor even the government itself – can manipulate the data and get away with it.