Blockchain technology allows records of monetary transactions to be transferred across many computers. These blocks cannot be modified retroactively without affecting the subsequent blocks. Blockchains are typically managed by peer-to-peer networks that decide to alter a block. This makes them secure by design.In 2008, blockchains were created to be a public ledger for Bitcoin transactions. Blockchains are essential to know for anyone interested in cryptocurrency. They help to solve the problem of a central server or trusted authority that can manage digital cash transactions. Enroll with our Blockchain courses to learn about it in detail.