What is bitcoin Harvard?

Bitcoin is an online communication protocol that facilitates virtual currency including electronic payments . Since its inception in 2009 by an anonymous group of developers, Bitcoin has served tens of millions of transactions with total dollar value in the billions.

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Why is blockchain so hard?

The point of a blockchain is that it’s not under the control of a single entity and this is violated with a forced upgrade . Instead, all upgrades have to be backwards-compatible. This is obviously quite difficult, especially if you want to add new features and even harder when thinking from a testing perspective.

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