Spiral
Bitcoin-focused entity within Block building and funding free, open-source projects.
Why We Recommend Spiral
Largest Bitcoin FOSS grant program in the world. Has issued 70+ grants worth $7,000,000+ to 40+ grantees across 20+ countries. Develops the Lightning Development Kit (LDK) and Bitcoin Development Kit (BDK).
Best For
Open-source developers focused on Bitcoin privacy, security, UX, and scalability. Projects working on Layer 2 solutions, mining decentralization, and private key management.
Services & Features
- FOSS grants program
- Lightning Development Kit (LDK)
- Bitcoin Development Kit (BDK)
- Bitcoin Wizards R&D hiring
- UX and scaling improvements
- Privacy and security research
Considerations
Projects must be free and open-source without a business or profit motive.
