Altcoins Talks - Cryptocurrency Forum
Learning & News => Further Education => For Beginners => Terminology => Topic started by: Mounty on July 01, 2018, 12:06:41 PM
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This the problem that the blockchain tried to resolve through the proof of work, sometimes it can be possible as a result of a 51% Attack, hack of the Blockchain which allows a coin/token to be spent more than ones.
More info about double spending: