The pros of the blockchain include the fact that it provides an immutable record of transactions that can never be altered, an unhackable infrastructure where all transactions are time-stamped and verified, and a virtually unlimited list of potential applications. Many transactions between people or computers can be made more securely with the use of a blockchain. In addition, with cryptocurrencies, you can use the blockchain to send funds across international borders for less than a penny and, depending on the blockchain you use, in seconds. Blockchains also come with some cons. In the context of cryptocurrency, if someone were to steal the code that identifies your wallet, they can send funds anywhere they want. Also, some blockchains require immense amounts of energy to function because of the energy used by the computers that solve the mathematical puzzles that power the chain.