Block and chain, since the word suggests, a sequence made of blocks! So we know very well what are these blocks. Blocks can be a kind of database! People who work on computers know databases perfectly! And for those that do not know, when we say in simple language, then https://www.maanation.com/post/358020_block-and-chain-since-the-word-suggests-a-sequence-made-of-blocks-so-we-determin.html