This module will cover the core features of blockchain and distributed ledger technologies and their application to different business domains, with a particular focus on the financial services industry. We will start by discussing the mechanics of the pioneering cryptocurrency Bitcoin, including basics of cryptography, proof-of-work consensus algorithm and peer-to-peer networking.We will then explore other major blockchain platforms such as Ethereum, XRP Ledger and EOS as well as associated cryptocurrencies. We will examine the advantages and limitations of different blockchains. We will also review the evolution of the sector in the Decentralised Finance area (DeFi), the adoption of the technology and its current and future challenges. A more hands-on part of the module will be devoted to smart contracts design and deployment on public and permissioned blockchains.