Blockchain is an incorruptible digital ledger that can record transactions of value such as financial or other transactions. It transitions trust from entities to trust in an algorithm through cryptography, blockchains, and consensus algorithms. This allows for decentralized trust and even anonymous transactions. Blockchain has evolved from cryptocurrencies like Bitcoin to include smart contracts on platforms like Ethereum that allow many use cases across private, consortium, and public networks. It could revolutionize how we think about concepts like money, organizations, social networks, and trade.