Tether, the issuer of the world's largest stablecoin, USDT, just doubled down on its commitment to hard assets by adding a massive $1 billion in bitcoin, boosting its total reserves to a commanding $9.7 billion. In today's "Chart of the Day," presented by Crypto.com, CoinDesk's Jennifer Sanasie breaks down the move, which comes on the heels of the unveiling of USAT, Tether's new U.S. stablecoin, earlier this month.