The cryptocurrency world is even more concentrated than most observers probably realize. While large holders of Bitcoin that are commonly referred to as whales own almost a fifth of the largest cryptocurrency, researcher Coin Metrics says the unique identifiers known as addresses show that only about 300 entities control around 80% of Tether, the token that serves as a conduit for trading on many of the world’s largest crypto exchanges. Tether has been at the center of controversy since it was introduced in 2015 as a way to provide liquidity to exchanges because lingering concerns about illegal uses have made it ... (full story)