LILYA TESSLER leads Sidley’s FinTech and Blockchain group, which is recognized as a Band 1 practice in the 2025 Chambers FinTech guide and was named “FinTech Practice Group of the Year” by Law360 (2020). She focuses her practice on representing digital asset trading platforms, blockchain technology companies, U.S. and non-U.S. broker-dealers, financial services firms, and cryptocurrency funds. Lilya has been ranked by Chambers FinTech for FinTech Legal: Blockchain & Cryptocurrencies – USA – Nationwide (2020–2025), including a Band 1 ranking since 2022. She has also been ranked for her work in Crypto-Asset Disputes – USA – Nationwide (2024-2025). In the 2025 edition of Chambers FinTech, clients are impressed by her “fantastic insight not only into legal issues but also market trends…very pragmatic approach to solving problems…[how] she really understands discussions about the tech and how that drives different conclusions from a regulatory perspective.”
Lilya advises technology companies and investment firms on tokenization of real-world assets, public and private securities offerings, and blockchain token sales. She also counsels financial institutions and digital asset exchanges with day-to-day securities issues, custody rule requirements, cross-border regulatory issues, money services business registration requirements, as well as FINRA and SEC regulatory inquiries. She advises several U.S. and non-U.S. FinTech companies, including robo-advisors and high-frequency trading firms in evaluating the broker-dealer and investment adviser registration requirements. She regularly advises clients in SEC and CFTC investigations and litigations that relate to complex digital asset legal and regulatory issues.
Lilya is a member of Sidley’s global Securities Enforcement and Regulatory practice, which was named the “Law Firm of the Year” for Securities Regulation in 2024 and for Litigation – Regulatory Enforcement (SEC, Telecom, Energy) in 2023 by U.S. News – Best Lawyers. She works with transactional lawyers on structuring deals involving financial services and technology companies, digital asset exchanges, and blockchain token offerings. She regularly assists both financial services firms and their vendors in negotiating U.S. and cross-border technology agreements for all types of services and considering the U.S. securities laws and broker-dealer regulatory issues associated with such technologies. Her recent work has extended to advising how issues related to digital assets could play out in the context of bankruptcy proceedings and enforcement matters.
Lilya is a frequent speaker and writer on various topics in FinTech, with a particular focus on distributed ledger technology, blockchain tokens, and digital asset trading platforms. In June 2024, Lilya testified before the U.S. House Financial Services Committee’s Subcommittee on Digital Assets, Financial Technology, and Inclusion, on “Next Generation Infrastructure: How Tokenization of Real-World Assets Will Facilitate Efficient Markets.”
Lilya is co-chair of the Digital Chamber’s Token Alliance and is the founder and co-chair of the Digital Asset Regulatory and Legal Alliance (DARLA), an industry working group consisting of general counsel and chief compliance officers of prominent blockchain and digital asset businesses. Lilya was a certified public accountant, FINRA dispute resolution arbitrator, and previously held FINRA Series 7 and 24 licenses.
Prior to joining Sidley, Lilya was co-head of the FinTech and Blockchain Group and a leader of the broker-dealer practice at another global law firm.
Awards
- Chambers FinTech, USA FinTech Legal: Blockchain & Cryptocurrencies (2020–2025), including a Band 1 ranking since 2022
- Chambers FinTech, USA Crypto-Asset Disputes (2024–2025)
- The Texas Lawyer, Texas Legal Awards, “Rising Star” (2023)
- Law360, Fintech “MVP” (2022) and Fintech “Rising Star” (2019)