HTX Research: Evolution of On-Chain Enforcement and Blacklisting Systems - Regulatory Truth, Power Boundaries, and the Disorder of the Crypto World (2022-2026)

1. Introduction

The period from 2022 to 2026 represents the most pivotal four years in the history of global crypto asset regulation. On August 8, 2022, OFAC, acting under the IEEPA, added 44 Tornado Cash smart contract addresses to the SDN sanctions list—marking the first time the U.S. government sanctioned a piece of "code" rather than a "person." The effect of this executive order was subsequently deconstructed by immutable code: Circle froze USDC, GitHub closed repositories, and Uniswap blocked the front end, yet the underlying contracts remained completely unaffected, with Tornado Cash still processing approximately $2.5 billion in transactions during the sanctions period. Four years later, on-chain enforcement has evolved from a single-jurisdiction administrative action to a multi-layered governance system—yet issues concerning its effectiveness boundaries, legitimacy, and checks and balances are even more pronounced than four years ago.

2. The Tornado Cash Case: A Textbook Example of Regulatory Overreach

The Tornado Cash case is the most important on-chain enforcement precedent of the past four years. The sanctions imposed in August 2022 sent shockwaves through the industry: GitHub closed the code repository, Circle froze USDC addresses that had interacted with Tornado Cash, and Uniswap blocked related trading pairs on its front end—yet the underlying contracts remained entirely unaffected. The power of a single executive order was completely deconstructed by a line of immutable code. OFAC's enforcement assumption was based on a fundamental miscalculation: believing that "freezing the front end" is equivalent to "freezing the protocol." The result proved these are two different things—sanctions lists are compliance inventories, not physical bans. Front-end service providers will comply, but blockchain code does not need to.

On November 26, 2024, the U.S. Court of Appeals for the Fifth Circuit issued a landmark ruling in *Van Loon v. Treasury Department*, finding that OFAC had exceeded its authority: immutable smart contracts do not constitute "property" under the IEEPA because they cannot be owned or controlled by anyone; they are merely "lines of code." On March 14, 2025, OFAC officially removed Tornado Cash from the SDN list. This nearly three-year-long legal battle established a principle at the institutional level: regulators cannot use "catch-all" laws like the IEEPA to expand their power indefinitely; they require clear authorization from Congress. The era of "administrative convenience" in U.S. crypto regulation is over, and "certainty" itself has become the industry's greatest institutional dividend.

However, this is far from the endgame. Prosecutors have shifted to a strategy of "if you can't beat the rules, target the people"—the individual criminal charges against developers Roman Storm and Roman Semenov are still moving forward. A conviction for Storm would set a dangerous precedent: writing code equals assuming criminal liability, casting a chilling effect over the entire open-source developer community. The prosecution's logic shows a clear risk of slippery slope reasoning: Tornado Cash was used by North Korean hackers → the developers knew → the developers did not prevent it → the developers constitute a conspiracy to commit an un-committed crime. The outcome of the Roman Storm trial will determine the legal foundation of the entire DeFi industry.

3. Enhanced Enforcement Against Mixers: From Individual Prosecution to Systematic Attack

The Tornado Cash case changed the enforcement paradigm. The DOJ demonstrated something in the Samourai Wallet case: you can lose the war against a protocol, but you can absolutely win the war against its developers. In April 2024, the DOJ filed charges against the two founders; in July 2025, they pleaded guilty in the U.S. District Court for the Southern District of New York, facing a maximum of 5 years in prison. The prosecution's logic was extremely shrewd: Samourai was not "pure code," but a "complete service system" including a UI, servers, and a fee model. This distinction—between pure code and a hybrid service system with operator involvement—is the most critical legal watershed of the next five years. Its implication is clear: as long as your protocol is maintained and monetized by someone, it is not just "code" but a "service," and you become responsible for its misuse. Once this boundary is judicially confirmed, the operators of all DeFi protocols will face legal risks.

Enforcement is escalating globally. In November 2023, OFAC sanctioned Sinbad.io; in March 2025, Germany's BKA, together with the U.S., Netherlands, and Finland, targeted Garantex; in February 2025, the EU sanctioned Garantex for the first time. Ironically, the stricter the enforcement against mixers becomes, the more efficient North Korea's money laundering appears to be—the $1.5 billion Bybit hack in 2025 set the record for the largest single theft in crypto history, bringing North Korea's total stolen funds to $6.75 billion. Another landmark event in 2025 was OFAC's attempt at "retroactive accountability" against historical Tornado Cash users: the DOJ began subpoenaing early users, suggesting that regulators are exploring a new path of "targeting users" rather than "targeting the protocol."

4. The Rise of the On-Chain Analytics Industry and Blacklist Infrastructure

The true power center of on-chain enforcement lies not with governments, but with the four major blockchain analytics platforms. Between 2022 and 2026, Chainalysis, TRM Labs, Elliptic, and Merkle Science completed a transition from "address labeling tools" to "extensions of quasi-judicial power." Once an address is flagged as "high-risk," exchanges freeze the account, and USDT issuers freeze the assets—a process with almost no avenue for appeal. Chainalysis covers over 27 blockchains, its Reactor tool is used by over 1,500 agencies including the FBI, DOJ, and IRS, and it holds approximately a 45% share of the global law enforcement market. Its knowledge graph links over 1 billion addresses to more than 134,000 real-world entities—effectively creating an "on-chain ID card" system. Who an address belongs to is no longer decided by blockchain mathematics but by Chainalysis algorithms. TRM Labs monitors over 75% of the world's crypto transaction volume.

The Beacon Network, launched in 2025, represents the next stage in the evolution of on-chain compliance infrastructure. As the industry's first real-time information-sharing platform, it connects core participants like Tether, TRON, and the T3 Financial Crime Unit to a unified data layer, theoretically compressing the freeze-and-destroy window from hours to minutes. However, the lack of external oversight over this power expansion is the current system's biggest institutional flaw—on-chain analytics firms act as both "evidence collectors" and "fact-finders," where their labeling conclusions directly determine whether an address is frozen or a person is denied service, without any independent appeals process.

The most concerning are the stablecoin issuers. Tether's USDT smart contract has built-in `addBlackList`, `removeBlackList`, and `destroyBlackFunds` functions, effectively embedding a "central bank" function into a commercial company's contract. In 2025, Tether added 4,163 addresses to its blacklist, freezing $1.26 billion and permanently destroying $698 million. 96.4% of blacklisted addresses were never removed that year. This is not "compliance"; it is "quasi-judicial power." The TRON network's multi-signature wallet freeze has a 44-minute delay window—a "system flaw" that serves as a "lifeline" for ordinary users. But as stablecoin issuers upgrade their multi-signature architectures, the "controllability" of on-chain assets will increasingly resemble traditional bank accounts—a fundamental challenge to the "decentralization" narrative of the crypto industry.

5. Accelerated Construction of Global Regulatory Frameworks: From Fragmentation to Systematization

Over the past four years, the biggest loser in the global crypto regulatory framework has been the United States, and the biggest winner has been Europe. This reflects not just a difference in legislative speed, but a difference in regulatory philosophy. Europe has established a complete system with MiCA (passed in May 2023, implemented in phases from 2024, fully effective in 2025): CASP licenses, stablecoin reserve disclosures, extension of the FATF Travel Rule, and the AMLA (operational from 2025, directly supervising high-risk CASPs from 2028). The real significance of MiCA is not its strictness, but the "certainty" it provides—institutional capital can be deployed based on clear rules, and fiat-backed stablecoins can operate within a compliant framework.

In contrast, the U.S. has spent four years consumed by political polarization. In July 2025, the House passed the CLARITY Act with a vote of 294 to 134, establishing the jurisdictional division between the SEC and CFTC, safe harbor provisions for DeFi developers, and the legal status of self-custody wallets—but as of April 2026, it remains stalled in the Senate Banking Committee. The bipartisan divide is not over *whether* to regulate, but *who* regulates—which precisely exposes the biggest problem with U.S. crypto regulation: politics. From 2024 to 2026, the SEC's sequential lawsuits against Coinbase, Robinhood, and Uniswap consumed significant regulatory resources: the SEC partially lost the Ripple case and was forced to drop several charges in the Coinbase case. This pattern of "fighting and losing" has dramatically increased legal uncertainty for the U.S. crypto industry.

The Asia-Pacific region is diverging but trending towards standardization. The Hong Kong Monetary Authority (HKMA) advanced stablecoin issuer regulation in 2026; Singapore retains the MAS Major Payment Institution license pathway for institutional-grade digital assets; Japan included stablecoins under regulation through amendments to the Payment Services Act; and South Korea enacted the Virtual Asset User Protection Act. The global influence of the FATF is particularly noteworthy—its March 2026 report, *Stablecoins and Non-Custodial Wallets: A Thematic Report on P2P Transactions*, explicitly warns that non-custodial wallets and P2P transactions are the weakest links in the global anti-money laundering system. Over the next two to three years, DeFi and non-custodial wallets will face a new wave of compliance pressure.

6. Sanctions Evasion and the Challenge of State Actors

A 2026 Chainalysis report reveals an uncomfortable truth for all on-chain enforcement tools: in 2025, activities of sanctioned entities accounted for 68% of total illicit crypto transaction volume. This means that today's on-chain enforcement is primarily fighting not hackers and scammers, but three sovereign states—North Korea, Russia, and Iran.

North Korea stole $2 billion in 2025, bringing its cumulative total to $6.75 billion. The $1.5 billion Bybit hack in February set a record. North Korea's tactics have evolved from exploiting code vulnerabilities to infiltrating crypto company IT departments by posing as recruiters—this is no longer "crypto crime," but "state-level cyber warfare." Russia's strategy is the most systematic: its A7A5 ruble-pegged stablecoin processed $93.3 billion in transaction volume within four months of launch, effectively building a parallel crypto payment infrastructure to SWIFT; Garantex continued operations through technical means even after joint sanctions. The UK's OFSI advises companies to trace "3 to 5 transaction hops" to identify sanctions exposure risk—which is an official admission that list-based sanctions are ineffective against state-level adversaries. Iran has laundered over $2 billion and facilitated illegal oil sales and weapons procurement through proxy armed groups. Ultimately, when the adversary is a sovereign nation, OFAC's SDN list, Chainalysis's labeling system, and Tether's smart contract blacklist are all "treating symptoms, not the root cause." List-based enforcement against state-level opponents is essentially an industrialized version of a cat-and-mouse game, and the mouse will always run faster than the cat.

7. Industry Attitudes and the Privacy Rights Debate: Compliance Consensus and Fundamental Divergence

The deepening of on-chain enforcement has caused a deep split within the crypto industry. Leading exchanges like Coinbase and Kraken embrace compliance, using OFAC compliance, KYT screening, and reserve disclosures as competitive moats. Decentralized protocols like Uniswap and Curve adopt a "code is neutral" stance, arguing that the protocol layer should not bear compliance obligations. Privacy protocols like Tornado Cash and Aztec fundamentally question the legitimacy of on-chain enforcement. This split is not simply "pro-compliance vs. anti-compliance," but a direct collision between "centralized finance logic" and "native decentralized logic."

The fundamental disagreements over on-chain enforcement revolve around three key questions: First, where is the boundary between on-chain privacy rights and financial regulatory authority? MiCA requires all CASPs to perform KYC, effectively cutting off most privacy needs at the entry point, but DeFi front-ends and self-custody wallets remain in a grey area. Second, does the "neutrality" of a protocol constitute a legal liability exemption? The Tornado Cash case provided a "partial negative" answer: immutable code cannot be sanctioned, but a "service" with operators can be pursued. Third, how is the "quasi-judicial power" of stablecoin issuers to be supervised? Tether froze $1.26 billion in assets over the year, with 96.4% of addresses never being reinstated; this de facto permanent destruction lacks any independent audit or appeals mechanism. These three issues will become core topics of dialogue between regulators and the industry from 2026 to 2028.

8. On-Chain Labeling Platforms, Processes, and Multi-Party Ecosystem Dynamics

The technical foundation of on-chain enforcement rests on the labeling capabilities of blockchain analytics platforms. Chainalysis's Reactor, TRM Labs' TRM Forensics, and Elliptic's Navigator form the standard tool stack for global law enforcement agencies. The labeling process typically involves four steps: address clustering, fund tracing, risk scoring, and cross-chain tracking. The cascade of events following an address being labeled "high-risk" is: on-chain analytics platform flags it → USDT/USDC issuer freezes it → exchange KYC account frozen → OTC platform denies service → bank account refuses associated funds. This entire chain can be completed within hours, spanning both traditional finance and crypto finance.

The core contradiction in the multi-party ecosystem is the severe asymmetry between the "quasi-judicial power" of on-chain analytics firms and the "right to defense" of those labeled. Chainalysis has entity associations for over 1 billion addresses, but the algorithmic logic, confidence levels, and error rates of these associations are rarely made public. Tether and TRON executed freezes on 4,163 addresses, but there is no public "unfreezing appeals" process. Exchange KYT systems will reject funds from contaminated addresses, but users cannot find out why they are flagged or how to appeal. This reality of "opaque labeling, freezing without notice, and no channels for defreezing" means that beneath the "compliance cloak" of on-chain enforcement lies a potential infringement on the rights of ordinary users.

9. Future Outlook: Four Paradigm Shifts in Regulation

Based on a systematic review of the evolution of on-chain enforcement and blacklisting systems from 2022 to 2026, four fundamental paradigm shifts in regulatory models can be identified. The first shift is from list-based sanctions to risk-tiered management. The Tornado Cash case has proven that "one-size-fits-all" sanctions against decentralized protocols face both legal challenges and technological reality. Future regulation will increasingly rely on dynamic risk assessments based on multi-dimensional data; Chainalysis and TRM Labs already support hundreds of risk parameters, and this trend is irreversible.

The second shift is from single-jurisdiction action to multilateral coordination. The Garantex case and the Bybit incident exposed the limitations of unilateral sanctions. The establishment of the AMLA, the strengthening of the FATF, the launch of the Beacon Network, and the Basel Committee's review of bank crypto asset exposures mean multilateral cooperation will become standard. However, multilateral coordination faces real challenges: vastly different legal traditions across countries, making it difficult to reconcile the EU's "precautionary principle" with the US's "market failure" logic; and cross-border enforcement and evidence gathering require months or even years of judicial assistance procedures. The direction of this paradigm shift is correct, but the pace of specific implementation will be much slower than market expectations.

The third shift is from targeting protocols to pursuing individuals. The Samourai Wallet case and the Roman Storm trial have established a new paradigm: the focus of enforcement is shifting from sanctioning the protocol itself to pursuing the personal liability of its developers and operators. The CLARITY Act attempts to define the boundaries of liability through developer safe harbor provisions, but its final form depends on the interactive evolution of the legislative process and the outcome of the Storm trial.

The fourth shift is from confrontation to co-governance. The success of the Beacon Network shows that public-private partnerships have unique efficiency advantages—blockchain transparency plus the expertise of on-chain analytics firms equals faster fund tracing than traditional finance. But when stablecoin issuers have the unilateral power to freeze user assets, how should power boundaries and accountability mechanisms be designed? "Vigilante-style" enforcement lacking independent oversight and appeals mechanisms is an unavoidable core issue for the next phase of regulatory discussion.

Finally, tiered operational recommendations: For individual users, avoid direct interaction with mixers; do not approve unlimited token allowances on unknown DEXs; prioritize European exchanges with MiCA licenses as your main entry point; prefer bank transfers for fiat on-ramps; and diversify on-chain assets across hardware wallets and several trusted custodians to reduce the risk of complete loss from a single freeze event. For institutional investors, establish an on-chain asset KYT compliance framework; include sanctions exposure risk in investment due diligence checklists; choose stablecoins with complete audit reports and reserve disclosures; and conduct periodic "address hygiene" reviews of held wallets to avoid inadvertently receiving contaminated funds. For DeFi developers, actively study the legal logic of the Samourai and Tornado Cash rulings; introduce a layered architecture for "compliant interfaces" and "unregulated users" during the protocol design phase; and monitor the final version of the CLARITY Act's developer safe harbor provisions.