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This article explains the laws that apply when Bitcoin or other cryptocurrency is used as a means of transferring drug transaction payments, or when drug-related funds flow into a cryptocurrency over-the-counter (OTC) operation. It also outlines how Korean investigative authorities assess culpability and what legal issues arise in these cases.
 

1. How Cryptocurrency Becomes Linked to Drug Trafficking

Bitcoin and other virtual assets have become increasingly exploited as a means of transferring drug transaction payments, primarily due to their perceived anonymity and the ability to send funds across borders instantly.

A common structure involves a drug buyer depositing cash into an OTC channel, which then purchases Bitcoin and transfers it to a wallet address specified by the seller. Korean law enforcement has responded by establishing dedicated cryptocurrency investigation units to pursue these cases.

In a recent large-scale operation, the Gyeonggi Southern Police Agency investigated a drug network operating through Bitcoin and Telegram over approximately one year, arresting 122 individuals and detaining 47 of them pending prosecution.
 

2. Applicable Laws and Penalties

In cases where drug-related funds are traced through a cryptocurrency OTC operation, investigators do not limit their approach to a single charge. Multiple laws are applied concurrently as a combined offense.


1) Aiding and Abetting under the Narcotics Control Act (Criminal Act, Article 32)

Even without directly purchasing, selling, or distributing narcotics, a person who facilitates the transfer of drug transaction payments via Bitcoin may be prosecuted as an accomplice. Korean police have confirmed that individuals who assist in drug distribution through online virtual asset transactions — without ever meeting the drug dealer — can be charged with aiding and abetting under the Narcotics Control Act.

Under Article 58(1) of the Narcotics Control Act, the principal offender in a drug sale faces life imprisonment or a minimum of five years in prison. An accomplice, after the statutory reduction of one-half under Article 32(2) of the Criminal Act, may still face a minimum of two years and six months of imprisonment. This is not a minor charge.


2) Act on Reporting and Using Specified Financial Transaction Information (ARUSFTI) Violation

Operating an unlicensed virtual asset exchange service for profit — without registering with the Financial Intelligence Unit (FIU) — constitutes a violation of Article 7(1) of the ARUSFTI, punishable under Article 17(1) by up to five years in prison or a fine of up to KRW 50 million.

The key factor is "business continuity." Unlike a one-time transaction between acquaintances, repeated exchanges conducted for profit establish the commercial nature of the activity, making criminal prosecution far more straightforward for investigators.


3) Act on Regulation and Punishment of Criminal Proceeds Concealment (ARPCPC), Article 3

If a person transfers or converts funds while being aware — even vaguely — that those funds derive from illegal activity, this constitutes concealment or disguising of criminal proceeds. It is not necessary to know the specific nature of the crime. The penalty is up to five years in prison or a fine of up to KRW 30 million.
 

3. The Central Legal Issue: How Authorities Establish Criminal Intent

The most common defense in cryptocurrency OTC cases is: "I had no idea the funds were related to drugs." However, Korean courts have consistently held that full knowledge of the specific crime is not required.
 

"Such recognition is sufficient if the person was aware that the relevant property constitutes criminal proceeds as defined under the law — it is not necessary to know the specific type of crime or its concrete details." — Supreme Court of Korea, January 11, 2007, Decision 2006Do5288

In actual drug-related cryptocurrency cases, prosecutors and police have framed criminal intent in charging documents as follows: the suspect "transferred Bitcoin after recognizing and anticipating that the payment constituted the proceeds of narcotics transactions." This framing — recognition and anticipation — is how investigators establish what Korean law calls dolus eventualis (indirect intent, or awareness of probable consequences).

The external circumstances investigators use to infer this intent include:

• Informal transaction structure: Conducting transactions through Telegram rather than a licensed exchange, receiving funds via anonymous bank deposits
• Abnormally high commission rates: Charging 10–16% per transaction, far exceeding standard exchange fees. Investigators treat this as compensation for the legal risk — effectively a premium for facilitating illegal activity
• No customer verification (KYC): Failing to confirm the identity, purpose, or source of funds from any counterparty
• Concentration of transfers to a single wallet: The majority of Bitcoin transfers flowing consistently to the same wallet address, later identified as belonging to a drug seller
• Continued operation after prior investigation: Resuming OTC operations after having already been investigated for a related matter

When these factors are present in combination, investigators build the case that the suspect could not reasonably have been unaware of the illegal nature of the transactions.
 

4. How Korean Authorities Track Cryptocurrency Transactions

The assumption that cryptocurrency transactions are untraceable is no longer accurate. Korean law enforcement employs sophisticated methods to follow the money.


▪️Blockchain Forensics and On-Chain Data Analysis

Every Bitcoin transaction — its timestamp, wallet address, and amount — is permanently recorded on the blockchain and cannot be deleted. Once a drug seller's wallet address is identified, all wallet addresses that transferred Bitcoin to that address are immediately traceable, including OTC operators and their associated bank accounts.


▪️Exchange Warrants and Account Seizure

Domestic cryptocurrency exchanges are required by law to provide account information, transaction records, and identity verification data upon receipt of a warrant. A single transaction routed through a Korean exchange is sufficient for investigators to identify a person. The Supreme Court of Korea ruled in December 2025 that seizure of Bitcoin held in exchange-linked wallets is lawful, further expanding the investigative reach of authorities in cryptocurrency-related cases.
 

5. Key Legal Considerations If You Have Been Contacted by Authorities

▪️Clarify the Scope of the Charges Early

Aiding and abetting under the Narcotics Control Act, violations of the ARUSFTI, and violations of the ARPCPC each have different legal elements. Understanding which charges are actually in play — and designing a response strategy for each — should happen at the earliest possible stage.


▪️Objective Demonstration That Criminal Intent Was Absent

Saying "I didn't know" is not a legal defense in itself. What is required is an objective and documented account of why the transactions could reasonably have appeared legitimate — including any deception by the counterparty regarding their identity or the purpose of the funds. Relevant materials may include messaging records, transaction logs, and contemporaneous communications.

▪️The First Police Interview Is Critical

By the time investigators issue a summons, they have typically already obtained blockchain analysis results and financial records. Statements made in the first interview that are inconsistent with documentary evidence can be used to confirm the existence of criminal intent. It is strongly advisable to consult a legal professional and establish a clear statement strategy before attending any police interview.
 

DECENT Law Firm — Virtual Asset Practice Group

Cases involving Bitcoin and drug transactions in Korea sit at the intersection of criminal law, the Narcotics Control Act, financial regulation, and blockchain forensics. Each charge carries distinct legal elements and requires a tailored defense strategy.

DECENT Law Firm's Virtual Asset Practice Group has hands-on experience handling virtual asset-related narcotics investigations from the initial investigation stage through to trial.

If you have been contacted by Korean law enforcement or are uncertain about the scope of the allegations against you, we recommend seeking legal advice before your first interview.
 

This article is intended for general informational purposes only and does not constitute legal advice for any specific case or individual situation.