Castle Island Ventures

Alpen Labs is a startup focused on enhancing Bitcoin through zero-knowledge technology. The company aims to create a scalable and private Bitcoin ecosystem, which serves as universal infrastructure for financial transactions. By developing an online platform, Alpen Labs seeks to foster broader adoption of cryptocurrency and improve global financial access. Its ZK-enabled infrastructure empowers developers to build innovative solutions, ultimately contributing to a more inclusive financial future for everyday individuals.

Hata is a regulated cryptocurrency trading platform based in Kuala Lumpur, Malaysia, facilitating transactions between businesses and consumers using fiat currencies such as the US Dollar and Malaysian Ringgit. The company is committed to providing a secure and user-friendly environment for accessing cryptocurrencies, ensuring compliance with regulations set by the Securities Commission of Malaysia and the Labuan Financial Services Authority. Hata employs a multi-party computation protocol to enhance the safety of funds, thereby fostering investor confidence. Through its reliable services, Hata aims to make cryptocurrency accessible to all, reflecting its vision of promoting safe and effortless engagement with digital assets.

Yellow Card is a financial technology company that operates an online cryptocurrency trading platform, facilitating secure and cost-effective transactions across Africa. It specializes in providing on/off ramp services for stablecoins like USDT, USDC, and PYUSD, enabling users to buy and sell these coins using their local currencies. The company partners with local merchants and vendors to sell vouchers that can be redeemed for cryptocurrency, simplifying the money transfer process and promoting e-commerce participation. As of 2021, Yellow Card has facilitated over US$3 billion in transactions across 20 African countries, operating in the United States, Nigeria, Tanzania, Cameroon, Kenya, and South Africa.

SatLayer is a stealth-mode startup developing a modular security platform specifically designed for Bitcoin. Its core offering, Bitcoin Validated Service (BVS), aims to bolster the security of decentralized applications (dApps) and protocols within the cryptocurrency ecosystem.

Build on Bitcoin is a hybrid Layer-2 network Bitcoin blockchain

Alpen Labs is a startup focused on enhancing Bitcoin through zero-knowledge technology. The company aims to create a scalable and private Bitcoin ecosystem, which serves as universal infrastructure for financial transactions. By developing an online platform, Alpen Labs seeks to foster broader adoption of cryptocurrency and improve global financial access. Its ZK-enabled infrastructure empowers developers to build innovative solutions, ultimately contributing to a more inclusive financial future for everyday individuals.

Kollider develops tools and services designed to enhance access to financial markets through the use of Bitcoin's Lightning Network. The company offers an online trading platform that simplifies the buying and selling of cryptocurrencies, allowing users to open and close positions directly from their digital wallets. This streamlined approach aims to empower crypto traders by improving their return on investment and making trading more accessible across borders.

Yellow Card is a financial technology company that operates an online cryptocurrency trading platform, facilitating secure and cost-effective transactions across Africa. It specializes in providing on/off ramp services for stablecoins like USDT, USDC, and PYUSD, enabling users to buy and sell these coins using their local currencies. The company partners with local merchants and vendors to sell vouchers that can be redeemed for cryptocurrency, simplifying the money transfer process and promoting e-commerce participation. As of 2021, Yellow Card has facilitated over US$3 billion in transactions across 20 African countries, operating in the United States, Nigeria, Tanzania, Cameroon, Kenya, and South Africa.

Mash is a developer of an online financial platform that aims to address the challenges of monetization on the internet. The company facilitates value-for-value exchanges between content creators, organizations, and their audiences, promoting a new business model for the open internet. By providing friction-minimized streaming payments that are low-cost and instantly settled, Mash enables clients to effectively monetize their digital experiences through active user engagement. This innovative approach is designed to unlock new ways for producers and consumers to interact, enhancing the overall value exchange in the digital landscape. The platform operates on a foundation built around Bitcoin and the Lightning Network, although users do not need to have extensive knowledge of these technologies to benefit from the service.

Hoseki is developing a Bitcoin infrastructure platform that aims to facilitate proof-of-assets services for Bitcoin investors. The company focuses on bridging the gap between Bitcoin investors and traditional lending institutions, thereby enabling a more secure and straightforward way to prove ownership of Bitcoin assets. By emphasizing the importance of transparency and security in asset verification, Hoseki supports the vision of establishing Bitcoin as a global standard for currency.

Eaglebrook Advisors is a crypto-focused investment firm that specializes in providing financial advisors with secure and compliant access to bitcoin through its Bitcoin SMA. The firm has developed an asset management platform that facilitates financial advisory services by offering features such as portfolio integration, institutional custody, tax optimization, and liquidation. This platform enables users to manage their digital investments with ease while employing professional investment strategies.

Casa offers a secure storage solution for consumers and companies to safely store their digital wealth. Casa helps users manage their private keys, through the multi-location security model that removes single points of failure and protects users from theft, accidents, and disasters, providing them with the tools for securing their digital lives.

Yellow Card is a financial technology company that operates an online cryptocurrency trading platform, facilitating secure and cost-effective transactions across Africa. It specializes in providing on/off ramp services for stablecoins like USDT, USDC, and PYUSD, enabling users to buy and sell these coins using their local currencies. The company partners with local merchants and vendors to sell vouchers that can be redeemed for cryptocurrency, simplifying the money transfer process and promoting e-commerce participation. As of 2021, Yellow Card has facilitated over US$3 billion in transactions across 20 African countries, operating in the United States, Nigeria, Tanzania, Cameroon, Kenya, and South Africa.

Pintu is a cryptocurrency platform based in Jakarta, Indonesia, established in 2020. The company offers a mobile application that facilitates the buying, selling, and management of Bitcoin and other blockchain-based assets. Its platform provides users with a convenient way to access various financial services, allowing them to engage with the cryptocurrency market easily and securely. By streamlining the process of managing digital assets, Pintu aims to support the transition towards a more open financial system for its users.

Pintu is a cryptocurrency platform based in Jakarta, Indonesia, established in 2020. The company offers a mobile application that facilitates the buying, selling, and management of Bitcoin and other blockchain-based assets. Its platform provides users with a convenient way to access various financial services, allowing them to engage with the cryptocurrency market easily and securely. By streamlining the process of managing digital assets, Pintu aims to support the transition towards a more open financial system for its users.

Coin Metrics Inc. is a provider of blockchain and cryptocurrency data analytics, based in Cambridge, Massachusetts. Founded in 2017, the company specializes in delivering market and network data, analytics, and research to various industries and institutions involved in crypto-assets. Its offerings include the CM Network Data Pro, which provides comprehensive historical data on top cryptocurrency assets, and the CM Market Data Feed, which standardizes trade, candle, and order book data from multiple exchanges. Additionally, Coin Metrics offers CM Reference Rates, which present fixed asset pricing in U.S. dollars. By focusing on transparency and actionable data, Coin Metrics aims to empower individuals and organizations to make informed financial decisions related to cryptocurrencies.

Mash is a developer of an online financial platform that aims to address the challenges of monetization on the internet. The company facilitates value-for-value exchanges between content creators, organizations, and their audiences, promoting a new business model for the open internet. By providing friction-minimized streaming payments that are low-cost and instantly settled, Mash enables clients to effectively monetize their digital experiences through active user engagement. This innovative approach is designed to unlock new ways for producers and consumers to interact, enhancing the overall value exchange in the digital landscape. The platform operates on a foundation built around Bitcoin and the Lightning Network, although users do not need to have extensive knowledge of these technologies to benefit from the service.

River Financial Inc. is a financial technology company based in San Francisco, California, founded in 2019 by Alexander Leishman and Andrew Benson. The company specializes in providing a platform for individuals and institutions to buy, manage, and sell bitcoin. Its flagship product is a Bitcoin brokerage designed for sophisticated retail investors, offering a high-touch service that prioritizes security and client experience. River Financial's platform includes tools for investment performance, such as cost basis tracking, catering to the needs of its clients in the evolving cryptocurrency market.

Casa offers a secure storage solution for consumers and companies to safely store their digital wealth. Casa helps users manage their private keys, through the multi-location security model that removes single points of failure and protects users from theft, accidents, and disasters, providing them with the tools for securing their digital lives.

Hoseki is developing a Bitcoin infrastructure platform that aims to facilitate proof-of-assets services for Bitcoin investors. The company focuses on bridging the gap between Bitcoin investors and traditional lending institutions, thereby enabling a more secure and straightforward way to prove ownership of Bitcoin assets. By emphasizing the importance of transparency and security in asset verification, Hoseki supports the vision of establishing Bitcoin as a global standard for currency.

BlockFi, Inc. is a financial services firm that specializes in providing wealth management products for cryptocurrency investors. Founded in 2017 and headquartered in New York, BlockFi offers various services, including interest-bearing accounts for Bitcoin, Ether, and Gemini Dollar, as well as USD loans secured by clients' crypto assets. The company allows clients to trade cryptocurrency pairs and provides tailored lending solutions for both individual and institutional clients. By facilitating liquidity for blockchain asset holders, BlockFi aims to enhance transparency and efficiency in digital financial markets. The organization employs a robust infrastructure that integrates with multiple blockchains, positioning itself to adapt and expand its product offerings in response to the evolving needs of its users.

River Financial Inc. is a financial technology company based in San Francisco, California, founded in 2019 by Alexander Leishman and Andrew Benson. The company specializes in providing a platform for individuals and institutions to buy, manage, and sell bitcoin. Its flagship product is a Bitcoin brokerage designed for sophisticated retail investors, offering a high-touch service that prioritizes security and client experience. River Financial's platform includes tools for investment performance, such as cost basis tracking, catering to the needs of its clients in the evolving cryptocurrency market.

Coin Metrics Inc. is a provider of blockchain and cryptocurrency data analytics, based in Cambridge, Massachusetts. Founded in 2017, the company specializes in delivering market and network data, analytics, and research to various industries and institutions involved in crypto-assets. Its offerings include the CM Network Data Pro, which provides comprehensive historical data on top cryptocurrency assets, and the CM Market Data Feed, which standardizes trade, candle, and order book data from multiple exchanges. Additionally, Coin Metrics offers CM Reference Rates, which present fixed asset pricing in U.S. dollars. By focusing on transparency and actionable data, Coin Metrics aims to empower individuals and organizations to make informed financial decisions related to cryptocurrencies.

BlockFi, Inc. is a financial services firm that specializes in providing wealth management products for cryptocurrency investors. Founded in 2017 and headquartered in New York, BlockFi offers various services, including interest-bearing accounts for Bitcoin, Ether, and Gemini Dollar, as well as USD loans secured by clients' crypto assets. The company allows clients to trade cryptocurrency pairs and provides tailored lending solutions for both individual and institutional clients. By facilitating liquidity for blockchain asset holders, BlockFi aims to enhance transparency and efficiency in digital financial markets. The organization employs a robust infrastructure that integrates with multiple blockchains, positioning itself to adapt and expand its product offerings in response to the evolving needs of its users.

Flipside Crypto, Inc. is a Boston-based company that operates a cryptocurrency information platform delivering business intelligence for blockchain organizations. Established in 2017, it offers a range of services including cryptocurrency management, digital walleting, custody, community tools, and portfolio dashboards aimed at investors. Flipside Crypto provides analytics tools that offer insights into user behaviors, developer activities, and financial trends within the cryptocurrency space. It also features the Fundamental Crypto Asset Score (FCAS), a metric for assessing the health of cryptocurrency projects, which is distributed through partnerships with platforms such as CoinMarketCap and Messari. The company is supported by notable investors, including CoinBase Ventures and True Ventures.

Coin Metrics Inc. is a provider of blockchain and cryptocurrency data analytics, based in Cambridge, Massachusetts. Founded in 2017, the company specializes in delivering market and network data, analytics, and research to various industries and institutions involved in crypto-assets. Its offerings include the CM Network Data Pro, which provides comprehensive historical data on top cryptocurrency assets, and the CM Market Data Feed, which standardizes trade, candle, and order book data from multiple exchanges. Additionally, Coin Metrics offers CM Reference Rates, which present fixed asset pricing in U.S. dollars. By focusing on transparency and actionable data, Coin Metrics aims to empower individuals and organizations to make informed financial decisions related to cryptocurrencies.

Flipside Crypto, Inc. is a Boston-based company that operates a cryptocurrency information platform delivering business intelligence for blockchain organizations. Established in 2017, it offers a range of services including cryptocurrency management, digital walleting, custody, community tools, and portfolio dashboards aimed at investors. Flipside Crypto provides analytics tools that offer insights into user behaviors, developer activities, and financial trends within the cryptocurrency space. It also features the Fundamental Crypto Asset Score (FCAS), a metric for assessing the health of cryptocurrency projects, which is distributed through partnerships with platforms such as CoinMarketCap and Messari. The company is supported by notable investors, including CoinBase Ventures and True Ventures.