Just know that you dont have to do anything with the blockchain as a user of this technology. computer programs operate in the background that make all of this work seamlessly, while the user clicks, likes, up votes, shares, transfers money, and executes smart contracts. What is described in the video is what is going on while you do all of this. The video is only trying provide the viewer with a simple idea of the principles of a block chain and why it is distributed, along with a little about what mining is. That really is all most people need to know to have an appreciation for the main principles of what a block chain is. essentially it is an un forgeable ledger. The advent of this tech has allowed for steemit, a platform for free speech and freedom from censorship, it has also allowed for accounting transparency, peer to peer crowd funding and many many others, which we will discuss more in later videos.
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Thank you @starkerz - really appreciate your indepth answer