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However, the largest sites usually have many options for with government issued and altcoins.

Here are ten of the exchanges in no specific order.

Where do I such ? What are the cryptocurrency exchanges?

https://en.wikipedia.org/wiki/Currency

https://en.wikipedia.org/wiki/Currency_substitution

Cryptocurrency – Wikipedia

Bitcoin – Wikipedia

Cryptocurrency Market Capitalizations | CoinMarketCap

12 Cryptocurrency Alternatives To Bitcoin – Bankrate