In the diploma thesis we described the basic concepts and principles of the blockchain technology, which enables a decentralized way of data storing. The advantage of decentralized data storage is in a high integrity of stored data since it is virtually impossible to change it after saving it into the blockchain. We described the features of the three most popular and well known platforms of the blockchain - the Bitcoin platform, the Ethereum platform, and the Hyperledger Fabric platform - and compared them in details. Within the diploma thesis we established the local development environment of the Hyperledger Fabric blockchain and created a practical example of logging access logs into the blockchain via the Node.js REST endpoint. The solution enables manual data storing by addressing the corresponding REST request to the endpoint address or automatically storing access data within the KumuluzEE Logs module.
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