He is a Finnish computer scientist and software developer who contributed to the Bitcoin source code alongside Satoshi Nakamoto during its first two years and is known for making the first Bitcoin to fiat transaction, selling 5,050 BTC for $5.02. Nowadays, Martti Malmi focuses on developing Iris, one of the first Nostr clients. Martti is also recognized speaker at Bitcoin and Nostr conferences in all over the world.