One of the world’s largest crypto exchanges has raised a huge stash of capital from a blue chip financial titan. The Wyoming-based Kraken secured $200 million in a strategic investment from Citadel Securities, the nearly 25-year-old market maker, a Kraken spokesperson confirmed to Fortune. The investment valued the crypto exchange at $20 billion. The round comes shortly after Kraken closed an earlier round of financing in September in which it raised $600 million at a $15 billion valuation from ...