A U.S. senator has questioned Cantor Fitzgerald about Tether's reserve custody, setting an October 23 deadline, while the U.S. Treasury says it has identified about $1 billion in Iran-linked crypto assets and may seize them this week.
US Crypto Regulation and Enforcement Advance in Tandem
A U.S. senator recently sent questions to Cantor Fitzgerald regarding the reserve custody arrangements for stablecoin USDT, demanding that it explain its relationship with Tether and setting an October 23 deadline for a response. Meanwhile, the U.S. Treasury Department said it has identified about $1 billion in crypto assets linked to Iran and may seize them this week. The two developments point respectively to the custody structure of stablecoin reserves and the on-chain handling of funds in sanctions enforcement, showing that U.S. regulators' and law enforcement agencies' involvement in crypto asset fund chains is intensifying in tandem. The two matters are currently at the information inquiry and action preparation stages, respectively, and no final outcomes have been announced.
Focus of the Inquiry: Control Over Reserve Assets and USDT's On-Chain Freezing Capability
Based on information disclosed so far, the senator's inquiry focuses on two areas: first, control over Tether's reserve assets; second, the ability to freeze USDT on-chain. As Tether's reserve custodian, Cantor Fitzgerald has been asked to explain its relationship with Tether, with the response deadline set for October 23. This means the inquiry does not stop at the level of reserve size but goes further into who controls the reserves and under what conditions they can be disposed of. Directly naming the reserve custodian as the subject of the inquiry also makes the boundary of responsibility between the stablecoin issuer and the custodian part of the review.
Parties Involved: Issuer, Custodian, and Regulators
The matter involves multiple parties. Tether is the issuer of USDT and currently the largest stablecoin operator; Cantor Fitzgerald, as its reserve custodian, has been asked to explain the relationship between the two; and the U.S. senator is pushing for disclosure through written questions. Separately, the U.S. Treasury Department, in its law enforcement capacity, is taking action on crypto assets linked to Iran. Moves by multiple parties within the same period have made stablecoin reserves and on-chain fund flows an area of concentrated regulatory attention.
Why the Focus on Stablecoins: Trust Foundation and On-Chain Disposal Authority
USDT is currently the largest stablecoin on the market. The custody method for its reserve assets, the ownership of control, and the issuer's ability to freeze on-chain addresses are directly part of the market's trust foundation for the stablecoin. Whether reserves are held by an independent custodian and whether the issuer can restrict fund flows for certain addresses under specific circumstances are questions that must be answered when a stablecoin enters institutional funding and payment scenarios. This inquiry places the above two issues side by side, bringing both the regulatory and trust risks of the largest stablecoin to the fore.
Sanctions Enforcement: About $1 Billion in Iran-Linked Assets May Be Seized This Week
On another track, the U.S. Treasury Department said it has located about $1 billion in crypto assets linked to Iran and may carry out a seizure this week. This development shows that law enforcement actions and geopolitical sanctions are becoming important variables affecting crypto fund flows, and the ability to trace, identify, and seize on-chain assets has become part of the sanctions enforcement toolkit. For market participants, compliance reviews of funding sources and risk identification at the address level are correspondingly becoming more important.
Where the Two Threads Converge: Controllability Becomes the Common Keyword
The inquiry and the seizure proposal are close in time and point to the same category of issues: the controllability of crypto assets, especially stablecoin reserves and on-chain funds. Reserve custody arrangements determine the extent to which an issuer controls the underlying assets, on-chain freezing capability determines whether it can impose restrictions on specific addresses, and sanctions enforcement requires relevant parties to have the ability to identify and dispose of specific funds. The combination of the three places stablecoin issuers and reserve custodians at the intersection of regulatory scrutiny and law enforcement demands.
What to Watch Next: Response Deadline and Seizure Progress
Two areas of information need attention going forward. First, whether Cantor Fitzgerald can respond by the October 23 deadline regarding the control of Tether's reserve assets and USDT's on-chain freezing capability; whether the response is made public will affect outsiders' understanding of the reserve custody structure. Second, whether the U.S. Treasury Department carries out the seizure of about $1 billion in Iran-linked crypto assets this week, and whether there is further disclosure on the scale of the assets involved and the method of disposal. These developments will serve as important references for the market in observing stablecoin reserve arrangements and on-chain asset disposal mechanisms.