519 Blockchain refers to a distributed or decentralised public ledger or database of records of executed and shared digital events among participating parties. When persons transact in a blockchain system, a public record of all transactions is automatically generated and are visible to all participants which increase trust and reliability since participants can access the transactions from different nodes if one-point node fails. These transactions are verified by computers using sophisticated algorithms to confirm transfer of value and create a historical record of all activity which are impossible to change thus it contains an accurate and verifiable record of each and every transaction ever made which reduces opportunity for fraud.