What is a blockchain exactly? It's basically a ledger containing a history of transactions. Unlike an ordinary ledger or database, a blockchain has super characteristics. Here is a podcast I did in English which explains things in simple terms:
(Unsupported https://bit.tube/playerembed/80239/QmSiXPmcG5uuptJdxafHY6x5EReSEk653ZE6SrFi3yXwQF)
Or if you prefer you can read the article here.
For my Russian friends here is the video in Russian:
(Unsupported https://bit.tube/playerembed/80239/QmbFDTP1SBPPwEkrZhKrKzwWtcdRkqReWA2udLCkQKojhy)
Or you can read it in Russian Blockchained Explained_rus
Posted from my blog with SteemPress : http://stevee.ru/understanding-the-blockchain/