The cryptocurrency world, with its volatility, is all about FUD—fear, uncertainty, doubt. And nothing is generating more FUD right now than an unusual currency called tether. Unlike bitcoin and its many siblings, tether is what is called a stablecoin, an entity designed to not fluctuate in value. With most cryptocurrencies prone to wild swings, tether offers people who dabble in the market the option of buying a currency that its backers say is pegged to the US dollar.

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