Margo Tank focuses her practice on advising commercial enterprises and technology companies on the full spectrum of regulatory compliance matters related to the use of electronic signatures and records to enable digital transactions offered online and via mobile devices including utilizing smart contracts, blockchain technology and artificial intelligence. She also advises businesses on laws enabling money transmission and virtual currencies and other emerging payments mechanisms. Ms. Tank also advises clients on laws related to privacy and data security matters.

Margo began her legal career as counsel to the US House of Representatives, Committee on Banking and Financial Services. An early advocate for the financial services industry's acceptance and implementation of electronic signatures, she served as counsel to the Electronic Financial Services Council and assisted the group draft and lobby for the Electronic Signature in Global and National Commerce Act (ESIGN Act) and is currently counsel to the Electronic Signatures and Records Association, where she works to further electronic financial services policy before Congress and federal regulators. She also is counsel and co-reporter for Standards and Procedures for Electronic Records and Signatures (SPeRS). She is a member of the American Bar Association's Business Law Section and the Committee on the Law of Commerce in Cyberspace, is on the xDTM Standard Board of Governors and is a legal member participant in the Digital Chamber of Commerce's Smart Contracts Alliance. In 2016, she was appointed as an Observer to the Uniform Law Commission's Study Committee to Amend the Revised Uniform Law on Notarial Acts and the ULC Drafting Committee on Electronic Wills.

Margo has written books, articles and surveys on electronic signatures, smart contracts, virtual currency, privacy, financial services websites and mobile apps and more. She co-authored eight editions of Thomson Reuter's The Law of Electronic Signatures and Records (2012-2018) and three editions of Standards and Procedures for Electronic Signatures and Records (SPeRS), a compilation of guidelines, procedures, checklists and strategies for developing systems to create, deliver, sign, manage and transfer legally enforceable electronic records and signatures in commercial and consumer transactions; Enabled by Lenders, Embraced by Borrowers, Enforced by the Courts: What You Need to Know About eNotes, MERSCORP Holdings, Inc. (2018); Smart Contracts – 12 Use Cases for Business & Beyond – A Technology, Legal & Regulatory Introduction, Digital Chamber of Commerce in collaboration with Deliotte (2016); Electronic Retail Installment Sales Contract in California, The Review of Banking & Financial Services, Volume 33 No 12 (2017).