Blockchain Group vs. Citadel

The fight started with a letter. On April 6, the Blockchain Association told the Securities and Exchange Commission that Citadel Securities was trying to stretch old securities rules over blockchain infrastructure in ways the law does not support. The group said validators, autonomous smart contracts, and non-custodial software are not brokers or exchanges just because they help move tokenized assets across a network. It urged the SEC to use existing exemptive powers instead of waiting for a full rewrite of market structure rules (theblockchainassociation.org, sec.gov). That response was aimed at Citadel’s own filing from December 2, 2025. In that letter, Citadel said tokenized U.S. equities should not get broad relief from the statutory definitions of “exchange” and “broker-dealer.” It asked the SEC to identify every intermediary involved in tokenized stock trading, including activity routed through so-called decentralized protocols, and to move by notice-and-comment rulemaking rather than carve-outs. Citadel did not oppose tokenization itself. It opposed letting tokenization grow through exemptions that could bypass the plumbing and protections of the current equity market (sec.gov). That distinction matters because the SEC is already moving toward exactly the kind of carve-out Citadel dislikes. In a March 17 speech, SEC Chair Paul Atkins described a “token safe harbor” and a broader plan to tailor securities rules for crypto assets. In a November 2025 speech, he had already said the agency was considering a token taxonomy and a more workable framework for digital finance. Blockchain groups read those signals as an opening. Wall Street incumbents read them as a risk that parallel markets could be built before the rules are settled (sec.gov, sec.gov). So this is not really a food fight between one lobby and another. It is a fight over what counts as an intermediary when markets move onto software. Citadel’s letter argues that if a system performs functions that look like trading, routing, or matching, then the same investor-protection rules should follow. The DeFi Education Fund and its allies answered in December that this logic collapses the difference between a person running a securities business and open-source code that no one controls after deployment. The Blockchain Association’s April filing makes the same point in blunter terms: securities law regulates actors, not rails (sec.gov, sec.gov, theblockchainassociation.org). The deeper reason this has turned sharp is that tokenized equities are no longer hypothetical. DTCC said the SEC has already given The Depository Trust Company a no-action letter for a tokenization service covering select DTC-custodied stocks, ETFs, and fixed-income securities, with a three-year window to operate the service. That is a tightly controlled version of tokenization inside the existing market structure. Crypto advocates want the SEC to allow more experimental versions outside it. Incumbents are trying to make sure any future market still runs through regulated chokepoints they already understand, and often already dominate (dtcc.com, sifma.org). Citadel also reinforced its case in January with an economic paper by former SEC chief economist James Overdahl, who disclosed financial support from Citadel Securities. The paper argued that DeFi-based trading in tokenized equities could raise costs, weaken liquidity, and create a parallel regulatory regime with worse transparency and resiliency. The Blockchain Association’s answer was not to dispute that market design matters. It was to say Citadel was using those concerns to smuggle a much bigger claim into the debate: that the SEC should treat neutral blockchain infrastructure as if it were a securities firm. That is the real line in this battle, and both sides drew it in filings sitting on the SEC’s desk (sec.gov, sec.gov).