Welcome to the Voice of America’s News Words.The digital money bitcoin is traded online with a new accounting system.Blockchain.The concern with digital money like bitcoin is that,like everything else on the internet,people fear it can be hacked and stolen.But supporters say that is not possible with blockchain technology.A blockchain is a record of all the users’ transactions.Each completed transaction is called a “block.”It is linked to the previous blocks and saved.Together,the blocks form a blockchain that all users can see and that cannot be changed.

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