When a transaction occurs, it is encoded into a block of digital data and all members of the blockchain network agree to store and distribute data across the network. Each block is connected to the one before and after it, creating an immutable "blockchain". The entire database of transactions is stored on all network nodes and able to be viewed by all members of the network. these blocks of data and transactions are unable to be deleted even by a system administrator. Data on the blockchain can only be changed if a majority or super-majority of network participants agree.