Bitau seems complex, and it certainly is, but its center concept is actually quite straightforward.  A blockchain is a sort of database.  To have the ability to comprehend blockchain, it helps to understand what a database really is.  Information, or information, in databases is usually ordered in table format to permit for easier filtering and searching for particular info.   Spreadsheets are made for a single individual, or a little group of individuals, to shop and access restricted quantities of information. 
By comparison, a database was made to house substantially larger quantities of information which may be obtained, filtered, and controlled quickly and easily by numerous users at the same time. Massive databases reach this by home data on servers which are created from strong computers.