Jack Dorsey is an American technology entrepreneur, co-founder of Twitter and Block Inc. (formerly Square). Through Block’s independent developer arms (Spiral, TBD) and direct philanthropic initiatives, he is a major financier of open-source Bitcoin infrastructure, decentralized identity systems, and censorship-resistant social protocols. Profile Deep Dive ➡️

• Spiral Developer Funding (LDK & BDK) Backed the launch of Square Crypto in 2019 (rebranded to Spiral in 2021), which operates as an independent developer house creating the Lightning Development Kit (LDK) and Bitcoin Development Kit (BDK).
• Decentralized Infrastructure (TBD) Directs Block’s open-source division working on Web5 protocols for decentralized identity/data and tbDEX for trustless fiat-to-Bitcoin bridging.
• Nostr Protocol Incubation Financed early-stage development of the Nostr protocol in December 2022 with a ~14 BTC grant ($245k at the time) to support open-source relay and client engineering.
• Bitkey Development Supervised the creation and launch of Bitkey, Block’s self-custody hardware wallet aimed at simplifying key management for retail users.