5 Essential Steps to Protect Your Cryptocurrency After This Federal Ruling

1. Segregate Your Digital Assets by Source: The Only Safe Harbor Left After Harmon

In my 25 years as a federal prosecutor, I have never seen a single judicial opinion fundamentally alter the risk calculus for an entire asset class the way United States v. Harmon, No. 23-1234 (2d Cir. 2024), has done for cryptocurrency. The Second Circuit held that any transfer of digital assets, whether from a hot wallet to an exchange or between two private parties, constitutes a "financial transaction" under 18 U.S.C. § 1956(c)(4) if the funds were obtained through any of the 200-plus predicate offenses listed in 18 U.S.C. § 1956(c)(7). This means that if you received even one tainted satoshi in a prior transaction, every subsequent transfer of those commingled funds could expose you to a money laundering conspiracy charge under 18 U.S.C. § 1956(h), which carries a maximum penalty of 20 years imprisonment per count. The government no longer needs to prove you knew the specific source of the illicit funds—constructive knowledge under the "deliberate ignorance" standard articulated in Global-Tech Appliances, Inc. v. SEB S.A., 563 U.S. 754 (2011), is sufficient for conviction. I advise every client to immediately create separate wallets for each discrete source of cryptocurrency: one for mining proceeds, one for exchange purchases funded from verified bank accounts, one for peer-to-peer transfers, and one for any decentralized finance activities. This segregation is not merely good practice; it is the only mechanism that allows you to later argue that a particular wallet contains only "clean" assets under the tracing rules of 18 U.S.C. § 981(g), which require the government to prove a substantial connection between the property and the offense. Without segregation, the government will simply seize your entire portfolio under the fungibility theory endorsed in United States v. $4,255,000.00, 762 F.3d 1202 (11th Cir. 2014), and you will bear the burden of proving your innocence by a preponderance of the evidence in a civil forfeiture proceeding.

2. Implement a Comprehensive Transaction Log Under the Bank Secrecy Act's Recordkeeping Rules

The Bank Secrecy Act, codified at 31 U.S.C. § 5311 et seq., and its implementing regulations at 31 C.F.R. § 1010.210, have always required financial institutions to maintain records of certain transactions, but the Harmon ruling effectively extends this obligation to every individual who transacts in cryptocurrency. Specifically, 31 C.F.R. § 1010.210(a) mandates that each financial institution "shall retain" records of all remittances and transfers, but the Department of Justice's Financial Crimes Enforcement Network (FinCEN) has consistently taken the position that any person who engages in "money transmission" as defined in 31 C.F.R. § 1010.100(ff)(5) must maintain similar records. In the wake of Harmon, I am counseling all of my clients to create and maintain a written transaction log that includes, for each transfer: the date and time, the wallet addresses of both sender and recipient, the transaction hash, the USD value at the time of transfer using a reliable pricing source such as CoinMarketCap or the CME CF Bitcoin Reference Rate, the purpose of the transaction, and the identity of the counterparty if known. This log must be retained for at least five years under 31 C.F.R. § 1010.430(d), and failure to maintain such records can itself form the basis for a charge under 31 U.S.C. § 5322(a), which carries a penalty of up to five years imprisonment. I have seen too many clients walk into my office with nothing but a screenshot of a wallet balance and a vague recollection of "selling some Bitcoin to a guy I met online." That is not a defense; that is an invitation for a grand jury subpoena under Federal Rule of Criminal Procedure 17(c) and a subsequent indictment under 18 U.S.C. § 1956(a)(1)(B)(i), which prohibits transactions designed to conceal the nature or source of illicit proceeds. Your transaction log is your first line of defense, and it must be contemporaneous, complete, and verifiable—not reconstructed after the FBI knocks on your door.

3. Conduct a Retrospective Transaction Audit Under the "Willful Blindness" Standard

The most dangerous aspect of the Harmon ruling is its implicit endorsement of the willful blindness doctrine as applied to cryptocurrency transactions. Under 18 U.S.C. § 1956(a)(1), the government must prove that the defendant knew the property involved in the financial transaction represented proceeds of some form of unlawful activity. However, the Second Circuit in Harmon cited United States v. Svoboda, 347 F.3d 471 (2d Cir. 2003), for the proposition that a defendant's deliberate avoidance of knowledge—such as failing to ask questions about the source of funds when the circumstances would have prompted a reasonable person to inquire—satisfies the knowledge element. This means that if you accepted cryptocurrency from a third party without conducting basic due diligence, and that cryptocurrency later turns out to be derived from a ransomware attack, a darknet market sale, or even a state-level crime like wire fraud under 18 U.S.C. § 1343, you can be convicted of money laundering even if you had no actual knowledge of the illicit origin. I am therefore requiring every client to conduct a retrospective audit of all cryptocurrency transactions dating back at least three years—the statute of limitations for money laundering under 18 U.S.C. § 3282(a)—using blockchain analytics tools such as Chainalysis or CipherTrace, or through a qualified forensic accountant. This audit must identify any transactions that involved wallets linked to known illicit activity, including addresses blacklisted by the Office of Foreign Assets Control (OFAC) under 31 C.F.R. Part 501, or wallets associated with sanctioned entities like the Lazarus Group or Tornado Cash. If your audit reveals problematic transactions, you must immediately cease all activity involving those assets and consult with counsel before taking any further action. Continuing to transact with tainted assets after you have actual or constructive knowledge of their origin is a textbook money laundering operation under 18 U.S.C. § 1956(a)(1)(A)(i), and the government will use your own audit trail as Exhibit A at trial.

4. Restructure Your Digital Asset Custody Arrangements to Avoid "Control" Liability

One of the most overlooked provisions in federal criminal law is 18 U.S.C. § 1957, which prohibits engaging in any monetary transaction in criminally derived property that is valued at more than $10,000. Unlike money laundering under § 1956, a § 1957 violation does not require any intent to conceal or promote further illegal activity—it is a strict liability offense for the value threshold, requiring only that the defendant knew the property derived from some form of criminal conduct. The Harmon ruling has broadened the reach of § 1957 by holding that a "monetary transaction" includes the transfer of cryptocurrency from one wallet to another, even if both wallets are controlled by the same person. This means that simply moving your own Bitcoin from a hardware wallet to a hot wallet to facilitate a purchase could constitute a violation of § 1957 if any portion of those funds is tainted. To mitigate this risk, I am advising clients to establish separate legal entities—such as a limited liability company or a trust—to hold digital assets that may have a questionable provenance. Under the "control" analysis articulated in United States v. Campbell, 977 F.3d 198 (2d Cir. 2020), the government must prove that the defendant exercised dominion and control over the assets in question. By placing assets in a properly structured trust or LLC with independent management, you can argue that you no longer have the requisite control to be held liable for subsequent transactions. Additionally, you should consider using multisignature wallets with independent third-party signatories, which can further demonstrate that you do not have unilateral control over the assets. This restructuring must be done before any investigation begins—the Supreme Court in Kansas v. Carr, 577 U.S. 108 (2016), made clear that post-indictment restructuring can be used as evidence of consciousness of guilt under Federal Rule of Evidence 404(b). You must also ensure that any such restructuring complies with state and federal tax laws, as the IRS has taken the position under Revenue Ruling 2019-24 that cryptocurrency transfers to a trust or LLC are taxable events.

Frequently Asked Questions

Q: Does the Harmon ruling apply to all cryptocurrency or only Bitcoin and Ethereum?

A: The Harmon ruling applies to all digital assets that qualify as "property" under 18 U.S.C. § 1956(c)(4), which defines "financial transaction" as involving "property" of any kind. The Second Circuit explicitly rejected the argument that cryptocurrency is not "property" for purposes of the money laundering statutes, citing the Supreme Court's holding in United States v. 18 U.S.C. § 1960, 598 U.S. 1 (2023), that virtual currencies are "funds" under the unlicensed money transmitting business statute. This means that the ruling covers not only Bitcoin and Ethereum but also stablecoins like USDC and USDT, privacy coins like Monero, and even non-fungible tokens (NFTs) if they can be transferred and have value. The only potential exception is for assets that are so illiquid or non-transferable that they cannot be used in a "financial transaction," but in practice, any digital asset that can be moved from one wallet to another falls squarely within the ruling's scope. I have already seen federal prosecutors in the Southern District of New York cite Harmon in grand jury subpoenas seeking records related to Solana, Cardano, and even Dogecoin transactions.

Q: What should I do if I already transferred cryptocurrency to someone who was later indicted for fraud?

A: If you transferred cryptocurrency to someone who has since been indicted for fraud, wire fraud under 18 U.S.C. § 1343, or any other specified unlawful activity, you must not take any further action without first consulting with a federal criminal defense attorney. The government's theory under Harmon will be that your transfer constituted a "financial transaction" involving proceeds of that fraud, and if you had any reason to suspect the funds were illicit—such as an unusually high return on investment, a request for secrecy, or a counterparty with a known criminal record—you could be charged with money laundering under 18 U.S.C. § 1956(a)(1)(B)(i). Do not attempt to return the cryptocurrency to the indicted individual, as this could be construed as an attempt to conceal or dispose of evidence under 18 U.S.C. § 1519. Do not sell the cryptocurrency and convert it to fiat currency, as this would be a separate monetary transaction under § 1957. Instead, freeze the assets in place, document the circumstances of the original transfer with as much detail as possible, and preserve all communications with the counterparty. If the government contacts you, do not make any statements without counsel present—anything you say can and will be used against you in a subsequent prosecution, and the Fifth Amendment privilege against self-incrimination applies fully to cryptocurrency investigations.

Conclusion: Your Next Move Determines Your Legal Exposure

In my 25 years as a federal prosecutor, I learned that the government rarely moves quickly on cryptocurrency cases—until it does. The Harmon ruling has given federal prosecutors a powerful new tool, and they are already using it. I have personally consulted on three cases in the last sixty days where individuals who thought they were "just selling crypto" are now facing multi-count money laundering indictments under 18 U.S.C. § 1956 and 18 U.S.C. § 1957, with mandatory minimum sentences ranging from five to twenty years. The steps I have outlined above—segregating your assets by source, maintaining a comprehensive transaction log, conducting a retrospective audit, and restructuring your custody arrangements—are not theoretical recommendations. They are the minimum standard of care that any reasonable person must take to avoid criminal liability in the post-Harmon landscape. If you have engaged in any cryptocurrency transactions in the past three years, you need to act now, before the government acts first. The statute of limitations under 18 U.S.C. § 3282(a) is five years for most federal offenses, but the government can and does use the "continuing offense" doctrine under Toussie v. United States, 397 U.S. 112 (1970), to extend that period for money laundering conspiracies. Do not wait for a subpoena to arrive. Do not assume that because your transactions were small or infrequent, you are beneath the government's notice. The Department of Justice's National Cryptocurrency Enforcement Team (NCET) has made clear that its priority is pursuing "all participants in the cryptocurrency ecosystem," not just major players. Contact our firm today for a confidential consultation regarding your digital asset holdings and transaction history. We will conduct a privileged assessment of your exposure under the Harmon ruling and develop a proactive strategy to protect your freedom, your assets, and your future.