Sullivan & Cromwell is a law firm firm based in New York, United States that sullivan & cromwell is a us-headquartered international law firm founded in 1879, with about 875 lawyers across 13 offices in the americas, europe, asia and australia. it is known for m&a, capital markets, financial services regulation and litigation. its digital assets practice advises financial institutions, startups and consumer businesses on blockchain, cryptocurrency and stablecoin matters. the firm has advised on crypto enforcement, sec and cftc registrations and digital asset m&a, and served as lead debtors' counsel in the ftx chapter 11 bankruptcy. They serve clients in United States, United Kingdom, EU, Hong Kong, Japan, Australia. Sullivan & Cromwell is listed on The Token Playbook's vetted provider registry at thetokenplaybook.com/registry/sullivan-and-cromwell.