As of 2021, US$6.6 billion has been spent on blockchain solutions. The technology not only underpins the global cryptocurrency market but also provides unique utility for other sectors, like healthcare, logistics and real estate. A blockchain is a decentralized digital ledger made up of blocks that record data across a peer-to-peer (P2P) network. Once information is stored on this ledger, it becomes near impossible to delete, alter and hack.