Dan Held - The Essentials of Bitcoin Dan Held is director of business development at Kraken, one of the most well-known cryptocurrency exchanges in the world. He previously created the Interchange company dedicated to reconciling portfolios for institutional cryptocurrency traders. He also worked for Uber on Rider Growth / Global Data.Dan Held created the first crypto products such as ChangeTip, a bitcoin micropayment platform, and ZeroBlock, which provides real-time insight into the cryptocurrency market. He was part of the original 2013 crypto meetup group in San Francisco, which was made up of the founders of Coinbase, Ripple, Kraken, and others.