Paul Lewis, co-founder of the blockchain data analytics company Catallact, explains how useful the data extracted from public blockchain ledgers can be. Lewis describes, in detail, his background, what led up to the creation of Catallact, and some of the more interesting uses of on-chain analytics. He explains a recent event in which it had been believed Satoshis coins were moving, the market reaction to this, and how they analyzed the blockchain to reveal insightful information about this potentially exciting event. Lewis touches on the value of the public blockchain architecture and how traders and investors can leverage the available information to make important decisions based on hard data. Filmed on September 10, 2020.