Castle Island Ventures is a venture capital firm founded in 2018, specializing exclusively in public blockchains. The firm focuses on investing in infrastructure and application companies that enable transformative protocols to reach their full potential. Their mission is to support entrepreneurs building the necessary infrastructure and applications for the next billion users in the blockchain space.

The team comprises professionals with extensive experience in the financial services industry, including former executives from Fidelity Investments and other notable firms. Castle Island Ventures has raised multiple funds, including a $250 million fund announced in February 2022, targeting investments in monetary networks, financial services, and internet infrastructure. Their portfolio includes companies like BlockFi, Bitwise, and River Financial.