https://www.reuters.com/article/us-crypto-currencies-ripple/roughly-400-million-of-ripple-tokens-tied-to-illegal-activity-elliptic-idUSKBN1XU1NJ >About $400 million of XRP tokens, the currency for the Ripple payment network, is tied to illegal transactions, according to findings released on Wednesday by London-based Elliptic, a provider of risk management systems for the cryptocurrency industry.