Ethereum protocol

Guardtime, a cyber-security provider that uses blockchain systems to ensure the integrity of data, is partnering with the Estonian e-Health Authority to secure over a million health care records. Guardtime uses Keyless Signature Infrastructure (KSI), a blockchain technology that provides massive-scale data authentication without reliance on centralised trust authorities. Unlike traditional approaches that depend on asymmetric key cryptography, KSI uses only hash-function cryptography, allowing verification to rely only on the security of hash functions and the availability of a public ledger...

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