Jack Dorsey built Twitter and now he's building technology that can move Bitcoin even when the internet is down. – Dorsey was born in St. Louis in 1976. At just 15, he wrote dispatch software that taxi companies used to coordinate their drivers. – He later dropped out of college and moved to California, where he started working on an idea that would change how people communicate. – In 2006, he co-founded Twitter. His first tweet was: “just setting up my twttr.” – A few years later, in 2009, he co-founded Square, a payment company that started with a small card reader that allowed businesses to accept card payments through their phones. – But Dorsey was becoming increasingly interested in Bitcoin. – Square began supporting Bitcoin through Cash App and eventually started funding open-source Bitcoin development through Spiral. – In 2021, Square rebranded as Block, reflecting its growing focus on Bitcoin and other financial technologies. – Dorsey eventually stepped down as Twitter CEO in November 2021 to focus on Block and its Bitcoin ambitions. – Then, in July 2025, he introduced Bitchat, a messaging app that works without internet access, phone numbers or central servers. – It uses Bluetooth mesh networks to pass encrypted messages between nearby phones, with each device helping relay messages to others. – But there's another feature: Bitchat can also relay pre-signed Bitcoin transactions between devices over Bluetooth, meaning users can pass BTC transaction data without an internet connection. – The transaction still needs to reach a device with internet access before it can be broadcast and confirmed on the Bitcoin network. The man who helped change how the world communicates is now trying to change how people communicate and move money without relying on the internet