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Dogecoin started as a joke back in 2013 when IBM engineer Billy Markus and Adobe engineer Jackson Palmer created it. Bitcoin is the pioneer of cryptocurrencies, and its birth dates back to 2009. The total supply of Bitcoin was pre-defined at 21m. We already have 18.8m Bitcoin circulating in the market, leaving behind a very limited value before the mining stops for good. The coin is so concentrated that the top 2% of its users currently hold 95% of Bitcoin’s supply. Bitcoin mining is a very high maintenance task that requires costly investments.