Castle Island Ventures

We are a venture capital firm focused exclusively on public blockchains

About Us

We are a venture capital firm focused exclusively on public blockchains. We invest in infrastructure and application companies that will enable these transformative protocols to power services for the next billion users.

What We Do

We believe that permissionless blockchains represent a new form of politico-economic institution that will fundamentally alter market structures and spawn entirely new industries. 

We are focused on supporting entrepreneurs that are on a mission to build the infrastructure services to push these networks to their potential.

Our Team

We bring a wealth of experience building for cryptoassets networks from within the financial services industry to founders and early stage teams

Founding Partner

Matthew Walsh

Prior to founding Castle Island Ventures, Matt was a Vice President at Fidelity Investments where he led a number of the firm’s blockchain / cryptoasset initiatives. While at Fidelity, he led the creation, operationalization, and the investment strategy of a private fund focused exclusively on the cryptoasset sector.

Matt holds a BS in Business Administration from Babson College and an MBA from Duke University’s Fuqua School of Business.

Founding Partner

Nic Carter

Before joining Castle Island, Nic Carter worked for Fidelity as their first cryptoasset analyst, where he devised research perspectives on public blockchains.

He is the cofounder of, a platform devoted to demystifying on-chain data and bringing transparency to the industry. He has written extensively about token holder rights, cryptoasset governance models, and public blockchains as political institutions.

Nic blends pragmatism with a data-driven approach in determining how entrepreneurs can best interface with these new institutions. 

He holds an MA in Philosophy from the University of St Andrews and an MSc Finance and Investment from the University of Edinburgh.

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