Blockchain is a distributed database that works as a large register especially suitable for recording transactions or data ordered in time that are stored securely and without a mediator. The technology allows to keep a copy of the data and details of each transaction on both sides of it so that the blocks of each operation are linked as links in a chain with security that can not be deleted or modified. In any system in which there is some type of exchange, the chain block or blockchain can improve its transparency and traceability.