What is Blockchain?

Blockchain is a public list of records that is distributed, consistent, and irreversible. Since these records are distributed, there isn’t a sole person or entity that controls the information on the blockchain. It’s immutable and records are consistent across all nodes in the system.

IBM Blockchain Essentials

Blockchain technology provides the basis for a dynamic shared ledger that can be applied to save time when recording transactions between parties, remove costs associated with intermediaries, and reduce risks of fraud and tampering. The video lectures and lab in this course help you learn about blockchain for business and explore key use cases that …

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How Does Ethereum Work, Anyway?

In this article Preethi, a Blockchain Engineer, explains with great detail about what Ethereum is. This post covers important Ethereum concepts like gas, proof of work, and more. >20 min | medium.com  

Why Blockchain is Hard?

Jimmy Song goes briefly into what a blockchain is, then explain what the challenges are when developing on decentralized systems. 10-20 min | medium.com