Castle Island Ventures
53
companies
216
Jobs
Showing 53 companies
Blockchain and Crypto
Finance
Software
1 - 10 employees

Alkimiya Protocol builds capital markets for blockspace. They allow consensus producers to hedge or monetize the premium on cash flow from blockspace and use the cash flow accrued from blockspace as financial legos to construct yield sources.

11 - 50 employees

Alpen Labs is a startup scaling bitcoin with zero-knowledge technology. Its mission is to build universal rails for money by creating a scalable, private and programmable Bitcoin ecosystem.

Hardware
Mobile, Platforms, and Apps
Telecommunication
11 - 50 employees
Series A

Andrena is a developer of an internet distribution platform designed to offer high-speed internet at reduced costs.The company works directly with internet providers who provide internet for universities, hospitals, financial services and other users with heavy data needs and leverage their existing fiber networks to deploy a series of antennas to blanket a geography with internet access, allowing customers and businesses to tap into a faster network wirelessly.

Blockchain and Crypto
Finance
Internet Services
Software
1 - 10 employees
Series A

Arcade provides an infrastructure layer for NFT liquidity that enables the financialization of non-fungible assets, non-fungible tokens, or NFTs.Arcade’s Wrapped NFT technology allows NFTs to be bundled to secure one loan. Arcade is also an open-source Defi primitive it allows developers to build on top of the platform.

Finance
Lending and Investments
11 - 50 employees
Seed

Arch is a financial technology company focused on providing secure, reliable, and effortless financial products, particularly crypto-backed loans, to alternative asset investors. Founded by long-term crypto investors, Arch aims to address the shortcomings of traditional financial institutions by offering a fully automated lending platform with a strict no-rehypothecation policy, ensuring that customer assets are safeguarded with bank-grade security. The company emphasizes exceptional customer service and aims to be the leading provider in the crypto financial services sector, backed by significant funding to accelerate its growth.

Finance
Professional Services
Security
Software
11 - 50 employees

Attestiv develops an AI-powered digital media validation platform to reduce risk while improving the customer experience. Attestiv they are providing validation for all digital media with their platform and APIs for insurance and analysis, it scans existing photos, videos, or documents and determines if they are fraudulent.

Babylon
Babylon
9 jobs

At Babylon, we envision a future where Bitcoin and Proof-of-Stake (PoS) chains thrive together. Our mission is to build a Bitcoin-driven decentralized world by evolving Bitcoin into a trusted security backbone for PoS chains, delivering yields for bitcoin holders while fostering an integrated, secure, and decentralized economy. We trace our genesis to a transformative research paper on Bitcoin security, an original work co-authored by our co-founders, David Tse and Fisher Yu, the founder of EigenLayer, Sreeram Kannan and co-authors. Their combined intellect and foresight have set the cornerstone of Babylon. In a testament to our dedication to advancing the field, our research paper has been accepted by the highly-respected 2023 IEEE Symposium on Security and Privacy - a significant global platform for security discourse. The project is led by a team of consensus protocol researchers from Stanford and experienced layer 1 engineers from around the world. Babylon’s mission is to scale Bitcoin to secure the decentralized world. To achieve this, Babylon utilizes the three primary facets of Bitcoin: Bitcoin as an asset, its reliable timestamping service, its most censorship-resistant blockspace in the world. To leverage these facets, Babylon is developing three innovative security-sharing protocols: Bitcoin Staking Protocol, Bitcoin Timestamping Protocol, and Bitcoin Data Availability Protocol. Through these pioneering protocols, Babylon envisions a more secure and decentralized future.

Beam connects stablecoins to traditional bank accounts & payment networks. Their mission is to modernize money movement to unleash the internet's full potential to grow GDP.

Blockchain and Crypto
Finance
Lending and Investments
Software
51 - 200 employees
Series B

Bitwise Asset Management is a trusted partner to individuals, wealth managers, family offices, investment managers, and institutions in navigating cryptocurrency. Bitwise develops funds, indexes, insight, and other services. The team behind Bitwise has backgrounds in technology, security, and finance.

BOB
BOB
2 jobs

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

Casa
Casa
1 jobs
Blockchain and Crypto
Finance
Security
Software
51 - 200 employees
Series A

Casa was founded to help people own, secure, and manage their private keys safely and easily – without worry if they’re doing it right. We help people secure their digital wealth with more than one private key. That means making a single mistake doesn’t result in lost funds. Casa members can choose from a range of security levels — from a simple mobile wallet to a high-security vault. As time goes on, the use of private keys will become more widespread. We envision a future where private keys will secure everything important to us: money, identity, communications, and personal data. We are excited to continue our journey toward a world where people can take back control of their money, savings, and digital lives, and we appreciate all of the Casa members, teammates, and supporters who continue to make our work possible.

Consumer Products
Hardware
Security
11 - 50 employees
Seed

CAT Labs is developing cybersecurity and digital asset recovery solutions to assist governments in combating cryptocurrency crime and protecting investors from scams, fraud, and hacking.