South Korean Regulators Crack Down on Coinone Over Major Anti-Money Laundering Failures

South Korea’s financial authorities have imposed a 5.2 billion won penalty alongside a three-month partial suspension of operations on the cryptocurrency exchange Coinone after uncovering widespread deficiencies in its anti-money laundering controls. The action follows an extensive investigation conducted by the Financial Intelligence Unit, which identified roughly 70,000 cases in which the platform failed to properly verify user identities in accordance with national legal requirements. The findings point to a deep-rooted breakdown in the exchange’s internal compliance systems, raising concerns about its ability to prevent illicit financial activity within the country’s digital asset ecosystem. Regulators further stated that the company allegedly disregarded repeated warnings while continuing to process a significant number of transactions involving unregistered foreign entities. As a result, the exchange is now subject to operational restrictions that bar it from onboarding new customers and limit certain fund transfers until the suspension period concludes.

At the heart of the enforcement action are serious violations of the Act on Reporting and Using Specified Financial Transaction Information, which forms the backbone of South Korea’s financial regulatory regime. According to investigators, Coinone failed on a massive scale to carry out proper customer due diligence, with tens of thousands of user accounts left unverified. This failure extends beyond administrative oversight, exposing a critical weakness in the systems designed to combat financial crime. By allowing individuals without verified identities to access its services, the exchange effectively bypassed essential safeguards meant to ensure transparency and traceability in digital asset transactions. Authorities also found that the platform routinely marked user profiles as fully verified despite missing key identification details, revealing a consistent pattern of operational negligence. This systemic disregard enabled unverified users to continue trading unchecked, fostering conditions in which suspicious or potentially illicit activity could persist without detection.

The investigation also brought to light the exchange’s involvement in more than 10,000 unauthorized transactions linked to 16 unregistered overseas platforms. These dealings took place despite prior warnings issued by regulators about the risks of engaging with such entities. Within the global financial system, interactions with unregistered or non-compliant platforms are widely recognized as high-risk and often associated with money laundering concerns. The decision to continue facilitating these transactions suggests that the exchange prioritized maintaining transaction volumes over enforcing strict compliance with anti-money laundering standards. The Financial Intelligence Unit concluded that such conduct compromised the integrity of the broader financial system by enabling asset flows through channels that fall outside established legal and reporting frameworks. The substantial financial penalty is intended not only to punish these violations but also to compel stricter adherence to cross-border transaction rules moving forward.

The sanctions imposed represent one of the most severe enforcement actions in South Korea’s cryptocurrency sector in recent times, underscoring a broader tightening of regulatory oversight. In addition to the multi-billion-won fine—equivalent to approximately $3.5 million—the three-month suspension significantly disrupts the exchange’s business operations. During this period, Coinone is prohibited from registering new users and from allowing certain fund movements, a measure designed to prevent further compliance breaches while corrective actions are implemented. The company’s chief executive officer has also received a formal reprimand, signaling that accountability extends to top leadership when oversight mechanisms fail. Although the penalties are administrative rather than criminal, they carry substantial reputational and operational consequences and serve as a clear warning to other market participants. This action follows a comparable case involving Bithumb, another major exchange that faced even harsher sanctions for similar infractions, highlighting a consistent effort by authorities to enforce discipline across the industry.

The crackdown on Coinone forms part of a wider transformation in South Korea’s approach to regulating digital assets. Institutions such as the Bank of Korea and the Financial Intelligence Unit are driving a shift toward more stringent oversight, replacing what had previously been a relatively lenient regulatory environment. Among the most notable reforms is the introduction of a requirement for cryptocurrency platforms to reconcile their internal transaction records with actual asset holdings every five minutes. This marks a significant departure from the previous 24-hour reconciliation cycle, which regulators deemed insufficient for detecting discrepancies or safeguarding customer funds. The move toward near real-time auditing is intended to address past incidents involving operational errors and liquidity concerns, ensuring that exchanges maintain adequate reserves and accurate accounting systems.

In addition to these measures, the central bank is advocating for new legislative powers that would allow exchanges to halt trading during periods of extreme market volatility or when suspicious activity is detected. This proposal reflects a strategic shift toward proactive risk management, enabling authorities and platforms to intervene before irregularities escalate into systemic disruptions. If implemented, such powers would provide a mechanism to temporarily pause trading in order to investigate abnormal price movements or transaction patterns, potentially preventing flash crashes and large-scale liquidations that could destabilize the market. The initiative signals that regulators now view cryptocurrencies not merely as speculative instruments but as components of the financial system that require safeguards comparable to those applied in traditional markets. Ongoing discussions between policymakers and regulators suggest that additional legislation focused on investor protection and market integrity is likely to emerge.

Fundamentally, the case against Coinone highlights critical flaws in the structure and execution of its compliance framework. Effective anti-money laundering systems depend on a continuous process of identifying, verifying, and monitoring users—an approach that collapses when the initial onboarding process is compromised. Allowing tens of thousands of users to trade without verified identities breaks the chain of accountability and creates significant blind spots for regulators and law enforcement agencies attempting to trace financial flows. The investigation revealed that the exchange not only failed to gather necessary information but also actively classified incomplete profiles as eligible for trading, indicating a deliberate circumvention of established safeguards. Such practices undermine trust between financial institutions and regulatory bodies, ultimately leading to the stringent penalties imposed in this case.

Addressing these systemic shortcomings will require more than financial penalties; it demands a comprehensive overhaul of the exchange’s internal controls and corporate approach to risk management. The three-month suspension period is intended to provide an opportunity for Coinone to rebuild its compliance infrastructure, including strengthening identity verification systems and potentially revalidating its entire user base. This process may involve deploying more advanced verification technologies and ensuring that all existing accounts meet regulatory standards. For the broader industry, the case serves as a stark reminder that innovation in financial technology does not exempt companies from adhering to established legal obligations. Transparency remains a foundational principle of the financial system, and cryptocurrency platforms are increasingly expected to meet the same standards as traditional banking institutions. As regulatory scrutiny intensifies globally, the ability to demonstrate a strong, proactive compliance culture will be a decisive factor in determining the long-term viability of digital asset platforms.

By fLEXI tEAM