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A blockchain, originally blockchain, is a growing list of records called blocks associated with cryptography. Each block contains a cryptographic hash from the previous block, a timestamp, and transaction information (usually represented as a Merkle tree).

Due to the design, a blockchain is resistant to data changes. It is "an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent manner". For use as a distributed ledger, a blockchain is typically managed by a peer-to-peer network that collectively adheres to a protocol for communicating between nodes and validating new blocks. Once registered, the data in a given block cannot be retroactively changed without modifying all subsequent blocks, which requires consensus of the network majority. While blockchain records are not immutable, blockchains can be considered secure by design and are an example of a distributed computer system with high Byzantine fault tolerance. Decentralized consensus has therefore been claimed with a blockchain.

Source: Wikipedia
Translated from Dutch with Google Translate

Blockchain e-learning courses and online courses for the IT professional.

OEM Office Elearning Menu offers Blockchain e-learning training and related online courses to also prepare you online for a corresponding certification. The teachers are not only certified, but also have many years of practical experience. This gives you the same knowledge and experience as with classic training. In addition, we also offer depending on the course Exam quizzes, Online mentor (if available) via chat or e-mail, MeasureUp exam simulation (if available (sometimes extra charge)), Live Labs (if available (extra charge)) and Tips and Tricks On.

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