The most favorable rate of purchase DOGE (0.00000034 DOGE/BTC - data for December 15, 2015), the most favorable rates of buy/sell of LTC and DASH. The exchange takes place within 5 minutes.
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Bitcoin.com is just one domain name used to promote Bitcoin. Bitcoin.com is not an official website. Just like nobody owns the email technology, nobody owns the Bitcoin network.
As such, nobody can speak with authority in the name of Bitcoin.