Key Takeaways
- • Project Eleven secured $20 million in Series A funding led by Castle Island Ventures at a $120 million post-money valuation, bringing total raised to $25.8 million including a prior $6 million seed round closed in June 2025.
- • The funding round includes participation from 10+ institutional investors, including Coinbase Ventures, Fin Capital, Variant Fund, Quantonation, Nebular, Formation, Lattice Fund, Satstreet Ventures, Nascent Ventures, and Balaji Srinivasan as an individual investor.
- • Project Eleven develops post-quantum cryptography (PQC) migration tools to protect digital asset infrastructure against quantum computing threats that could eventually compromise elliptic curve cryptography (ECC), the public-key standard securing over $4 trillion in crypto assets.
- • The company's platform addresses a critical institutional priority: readiness assessments, migration test environments, and deployment sequencing for networks like Bitcoin that require multi-year, cautious upgrades to remain secure post-quantum era.
- • Quantum computing advancement has elevated post-quantum cryptography from research to urgent planning priority for governments and financial institutions, positioning Project Eleven at the intersection of existential blockchain security and enterprise infrastructure migration.
Summary
Project Eleven, a post-quantum cryptography specialist, announced a $20 million Series A funding round led by Castle Island Ventures, marking significant institutional backing for quantum-resistant digital asset security. The round values the company at $120 million post-money and brings cumulative fundraising to $25.8 million, following a $6 million seed round co-led by Variant Fund and Quantonation in June 2025.
The Series A drew participation from a broad consortium of crypto-native and institutional venture firms, including Coinbase Ventures, Fin Capital, Lattice Fund, and emerging venture groups such as Satstreet Ventures and Nascent Ventures. Angel participation from Balaji Srinivasan signals institutional confidence in the cryptographic challenge the startup is addressing. This investor composition reflects growing recognition that post-quantum security represents both technical necessity and venture-scale opportunity.
Project Eleven builds practical tooling to manage the transition from elliptic curve cryptography (ECC)—the current public-key standard for Bitcoin, Ethereum, and other blockchain networks—to quantum-resistant algorithms. As quantum computing capabilities advance, researchers anticipate that sufficiently powerful quantum computers could eventually compromise ECC security, threatening the $4 trillion-plus digital asset ecosystem. The company's platform addresses this migration challenge by providing readiness assessments, testing environments, and deployment sequencing for networks governed cautiously by design, such as Bitcoin, which require years to execute protocol upgrades.
According to Nic Carter, General Partner at lead investor Castle Island Ventures, "Useful quantum computing is the biggest and most complex threat public blockchains have ever faced," positioning Project Eleven as building "the practical bridge from research to real-world deployment." CEO Alex Pruden framed the urgency: "As quantum capabilities advance, the stakes couldn't be higher. Networks like Bitcoin take years to upgrade because they're governed cautiously by design. We're focused on making the transition practical now, so the industry can migrate deliberately instead of improvising under pressure." This funding validates that post-quantum cryptography has transitioned from theoretical concern to active implementation priority across institutional and governmental stakeholders.
The Series A drew participation from a broad consortium of crypto-native and institutional venture firms, including Coinbase Ventures, Fin Capital, Lattice Fund, and emerging venture groups such as Satstreet Ventures and Nascent Ventures. Angel participation from Balaji Srinivasan signals institutional confidence in the cryptographic challenge the startup is addressing. This investor composition reflects growing recognition that post-quantum security represents both technical necessity and venture-scale opportunity.
Project Eleven builds practical tooling to manage the transition from elliptic curve cryptography (ECC)—the current public-key standard for Bitcoin, Ethereum, and other blockchain networks—to quantum-resistant algorithms. As quantum computing capabilities advance, researchers anticipate that sufficiently powerful quantum computers could eventually compromise ECC security, threatening the $4 trillion-plus digital asset ecosystem. The company's platform addresses this migration challenge by providing readiness assessments, testing environments, and deployment sequencing for networks governed cautiously by design, such as Bitcoin, which require years to execute protocol upgrades.
According to Nic Carter, General Partner at lead investor Castle Island Ventures, "Useful quantum computing is the biggest and most complex threat public blockchains have ever faced," positioning Project Eleven as building "the practical bridge from research to real-world deployment." CEO Alex Pruden framed the urgency: "As quantum capabilities advance, the stakes couldn't be higher. Networks like Bitcoin take years to upgrade because they're governed cautiously by design. We're focused on making the transition practical now, so the industry can migrate deliberately instead of improvising under pressure." This funding validates that post-quantum cryptography has transitioned from theoretical concern to active implementation priority across institutional and governmental stakeholders.
Go deeper than the headline
Research every firm in this story, track the ones that matter and get the daily briefing — free for 7 days.