Castle Island Ventures

Yellow Card operates as a leading digital currency exchange platform in Africa, specializing in the buying and selling of stablecoins such as USDT, USDC, and PYUSD. It serves individuals and businesses across 20 countries, offering secure and cost-effective methods for transactions using local currencies. The platform has facilitated over $3 billion in transactions, contributing to the growth of cryptocurrency adoption on the continent. Yellow Card collaborates with local merchants and vendors to provide vouchers that can be redeemed for Bitcoin, allowing customers to transfer money and engage in e-commerce. This integration enables individuals to participate in the digital economy, simplifying access to cryptocurrency for a broader audience.

SatLayer to protect any sort of dApp or protocol as a Bitcoin Validated Service (BVS), significantly enhancing security for all of cryptocurrency.

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

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 operates as a leading digital currency exchange platform in Africa, specializing in the buying and selling of stablecoins such as USDT, USDC, and PYUSD. It serves individuals and businesses across 20 countries, offering secure and cost-effective methods for transactions using local currencies. The platform has facilitated over $3 billion in transactions, contributing to the growth of cryptocurrency adoption on the continent. Yellow Card collaborates with local merchants and vendors to provide vouchers that can be redeemed for Bitcoin, allowing customers to transfer money and engage in e-commerce. This integration enables individuals to participate in the digital economy, simplifying access to cryptocurrency for a broader audience.

The internet is fundamentally broken. It's because of monetization. “Show me the incentives and I'll show you the outcome.” Our mission is to remonetize the web by enabling value for value monetary exchanges between pubs/creators/orgs and their users. A new business model for the open internet. We are unlocking this with friction-minimized streaming payments that are no/low cost, instantly settled, trust-minimized. It is built on the best global digital monetary network ever conceived, Bitcoin. Enabled by Lightning Network. Most users don't need to know this or be a Bitcoiner. Over time we suspect many will.

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 operates as a leading digital currency exchange platform in Africa, specializing in the buying and selling of stablecoins such as USDT, USDC, and PYUSD. It serves individuals and businesses across 20 countries, offering secure and cost-effective methods for transactions using local currencies. The platform has facilitated over $3 billion in transactions, contributing to the growth of cryptocurrency adoption on the continent. Yellow Card collaborates with local merchants and vendors to provide vouchers that can be redeemed for Bitcoin, allowing customers to transfer money and engage in e-commerce. This integration enables individuals to participate in the digital economy, simplifying access to cryptocurrency for a broader audience.

Pintu is a cryptocurrency platform based in Jakarta, Indonesia, that facilitates the buying, selling, and investing in Bitcoin and other blockchain-based assets. Launched in 2020, Pintu offers a mobile application designed to simplify access to the cryptocurrency market, allowing users to efficiently manage their digital assets. The platform includes features typical of a crypto exchange and provides various financial services, enabling users to safely engage with cryptocurrencies and contribute to the broader adoption of a decentralized financial system.

Pintu is a cryptocurrency platform based in Jakarta, Indonesia, that facilitates the buying, selling, and investing in Bitcoin and other blockchain-based assets. Launched in 2020, Pintu offers a mobile application designed to simplify access to the cryptocurrency market, allowing users to efficiently manage their digital assets. The platform includes features typical of a crypto exchange and provides various financial services, enabling users to safely engage with cryptocurrencies and contribute to the broader adoption of a decentralized financial system.

Coin Metrics Inc. is a provider of blockchain and cryptocurrency data, offering comprehensive market and network analytics to various industries. The company delivers a range of services, including the CM Network Data Pro, which provides historical crypto network data aggregated daily for prominent assets, and the CM Market Data Feed, which standardizes trade, candle, and order book data across multiple exchanges. Additionally, Coin Metrics offers CM Reference Rates, which provide fixed pricing for various assets quoted in U.S. dollars. Founded in 2017 and based in Cambridge, Massachusetts, Coin Metrics aims to empower institutions and individuals to make informed decisions regarding crypto assets by providing transparent and actionable data analytics.

The internet is fundamentally broken. It's because of monetization. “Show me the incentives and I'll show you the outcome.” Our mission is to remonetize the web by enabling value for value monetary exchanges between pubs/creators/orgs and their users. A new business model for the open internet. We are unlocking this with friction-minimized streaming payments that are no/low cost, instantly settled, trust-minimized. It is built on the best global digital monetary network ever conceived, Bitcoin. Enabled by Lightning Network. Most users don't need to know this or be a Bitcoiner. Over time we suspect many will.

River Financial is a challenger financial institution specializing in Bitcoin financial services. River Financial's flagship product, a Bitcoin brokerage, provides sophisticated retail investors with a high-touch platform to buy and sell Bitcoin. Founded in 2019 by Alexander Leishman and Andrew Benson, River's brokerage product provides its clients with best-in-class security, a world-class client service experience, and investment performance tools such as cost basis tracking.

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 New York-based financial services company that specializes in providing wealth management products for cryptocurrency investors. Founded in 2017, it offers interest-bearing accounts that allow clients to earn yields on their Bitcoin, Ether, and Gemini Dollar holdings. The company also facilitates secured loans in USD, where clients can collateralize their loans with cryptocurrency assets. Additionally, BlockFi provides a trading platform for exchanging various cryptocurrency pairs and customizable lending options for institutions. By leveraging a sophisticated infrastructure that integrates with multiple blockchains, BlockFi aims to enhance liquidity and efficiency in digital financial markets, catering to the needs of both individual and institutional clients.

Coin Metrics Inc. is a provider of blockchain and cryptocurrency data, offering comprehensive market and network analytics to various industries. The company delivers a range of services, including the CM Network Data Pro, which provides historical crypto network data aggregated daily for prominent assets, and the CM Market Data Feed, which standardizes trade, candle, and order book data across multiple exchanges. Additionally, Coin Metrics offers CM Reference Rates, which provide fixed pricing for various assets quoted in U.S. dollars. Founded in 2017 and based in Cambridge, Massachusetts, Coin Metrics aims to empower institutions and individuals to make informed decisions regarding crypto assets by providing transparent and actionable data analytics.

BlockFi, Inc. is a New York-based financial services company that specializes in providing wealth management products for cryptocurrency investors. Founded in 2017, it offers interest-bearing accounts that allow clients to earn yields on their Bitcoin, Ether, and Gemini Dollar holdings. The company also facilitates secured loans in USD, where clients can collateralize their loans with cryptocurrency assets. Additionally, BlockFi provides a trading platform for exchanging various cryptocurrency pairs and customizable lending options for institutions. By leveraging a sophisticated infrastructure that integrates with multiple blockchains, BlockFi aims to enhance liquidity and efficiency in digital financial markets, catering to the needs of both individual and institutional clients.

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, offering comprehensive market and network analytics to various industries. The company delivers a range of services, including the CM Network Data Pro, which provides historical crypto network data aggregated daily for prominent assets, and the CM Market Data Feed, which standardizes trade, candle, and order book data across multiple exchanges. Additionally, Coin Metrics offers CM Reference Rates, which provide fixed pricing for various assets quoted in U.S. dollars. Founded in 2017 and based in Cambridge, Massachusetts, Coin Metrics aims to empower institutions and individuals to make informed decisions regarding crypto assets by providing transparent and actionable data analytics.

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.