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What is a Blockchain?

The technology behind the Blockchain essentially is a very simple. This basic thought can totally change the way we will look at security of different processes that we use everyday.

bitcoins

What is Cryptocurrency and how to use it? Bitcoin or Ethereum?

What is Cryptocurrency? What Cryptocurrency to trade? What Cryptocurrency to invest? How to use Cryptocurrency? Are Bitcoin still profitable? How to use Cryptocurrency? Is still worth to invest in Bitcoin or better Ethereum?