Maelstrom Investment Fund is a crypto-native venture fund led by Arthur Hayes’ family office. Through its Bitcoin Grant Program, it provides $50k–$150k annual grants (paid in BTC or stablecoins) to open-source developers working on Bitcoin’s privacy, scalability, and decentralization. Past grantees have advanced projects like Payjoin, Silent Payments, and Bitcoin Core reviews, strengthening Bitcoin’s resilience without commercial strings attached.