Sergey Ostrovskiy is a distinguished lawyer specialising in corporate, investment, and commercial law, with a keen focus on innovation and technology companies, alternative finance and blockchain projects, venture capital and private equity firms, including their portfolio companies. A member of the International Bar Association.

He offers strategic counsel to management teams and boards of directors on complex corporate, technology, and intellectual property transactions, corporate governance and shareholder relations. Sergey represents major technology and finance companies, blockchain projects and DeFi protocols, addressing a wide range of corporate, legal, commercial, and compliance issues.

With profound expertise in the blockchain and cryptocurrency sectors, Sergey advises clients on the legal and regulatory aspects of their operations, including cross-border corporate structuring, shareholder relations, commercial operations, fundraising, and compliance. As lead counsel, he has successfully designed legal structures and regulatory strategies for numerous high-impact international Web3 projects and businesses, ranging from layer-1 blockchain protocols and DeFi platforms to DAOs, RWA & tokenization protocols, and digital payment service providers.

Sergey is a recognized expert in structuring fundraising initiatives for Web3 and blockchain enterprises, covering equity, debt, and token-based financings. As both strategic advisor and legal counsel, he has played a pivotal role in supporting clients through successful capital-raising efforts, helping them secure hundreds of millions of dollars through private and public token sales, IDOs, launchpads, launchpools, auction, and liquidity bootstrapping events.

Sergey is a co-founder of DAObox, a company specializing in legal structuring, governance and compliance solutions for decentralized autonomous organizations (DAOs) and Web3 communities. He co-authored "DAO 3.0: The Harmony Framework" – a jurisdiction-neutral DAO structuring playbook released in February 2025, which remains one of the most comprehensive public works on the matter up to date.

Additionally, Sergey contributes his expertise as an independent director on the boards of financial and blockchain companies, further cementing his role as a vital asset in the legal landscape of emerging technologies.