How Does the Government Seize Bitcoin? Forfeiture, Custody, and Defenses

Federal agents seize Bitcoin by tracing transactions across the public blockchain, obtaining a court-authorized warrant, and then either taking the private keys or ordering an exchange to hand over the balance. The coins are moved to a government-controlled wallet, and since March 2025 forfeited Bitcoin is deposited into a Strategic Bitcoin Reserve rather than auctioned off.¹ The Department of Justice’s largest single recovery, roughly $3.6 billion tied to the 2016 Bitfinex hack, shows how far blockchain forensics have come.²

Tracing the Coins on the Blockchain

Every Bitcoin transaction is recorded on a public ledger. Law enforcement runs that ledger through forensic software that follows funds from an illegal transaction through every subsequent transfer, then clusters wallet addresses that appear to belong to the same person or organization. Splitting funds across dozens of wallets does not break the chain. In the Bitfinex case, investigators traced coins through darknet markets, mixers, chain-hopping between different cryptocurrencies, and fictitious identities.²

The link to a real person almost always comes at an exchange. Centralized exchanges collect Know Your Customer data at sign-up: legal name, address, government ID. Under the Bank Secrecy Act’s Travel Rule, they also collect and transmit sender and receiver details for transfers of $3,000 or more.³ When the trail reaches an exchange, a subpoena or court order converts a blockchain address into an account holder.

The Legal Authority to Take the Coins

Federal seizures run through one of three tracks. Civil forfeiture under 18 U.S.C. § 981 lets the government seize property connected to certain federal crimes without ever charging the owner. The case is filed against the property itself; probable cause is enough, and no conviction is required.⁴ Criminal forfeiture under 21 U.S.C. § 853 is slower but tied to a conviction, with the forfeiture order entered at sentencing.⁵ Administrative forfeiture, available when seized property is worth $500,000 or less, skips a judge entirely: the agency publishes a notice, and if nobody files a claim within the deadline the property is forfeited automatically.⁶

Whichever track applies, a judge typically signs a seizure warrant before agents move any cryptocurrency. The warrant rests on a sworn affidavit describing the specific evidence that links the Bitcoin to the offense.⁷ Federal courts have preferred seizure warrants over restraining orders because a warrant lets agents take direct custody instead of relying on an exchange to freeze an account fast enough.

Taking Custody of the Wallet

Seizing Bitcoin is not like seizing a car. There is no object to tow. The government needs the private keys or seed phrase that controls the wallet, and it gets them in a few different ways.

During a search warrant execution, agents look for hardware wallets and for seed phrases stored on paper, in computer files, or stamped into metal. A seed phrase is a sequence of 12 to 25 random words that reconstructs full access to the funds. Once agents find it, they can sweep the wallet.

In other cases the defendant hands over access as part of plea negotiations. Cooperating on asset recovery can produce more favorable sentencing terms, so there is a practical incentive to turn over the keys rather than force a forensic hunt.

When the Bitcoin sits on a centralized exchange, the process is simpler. The government serves a court order and the exchange, which controls the private keys in a custodial account, freezes the balance and transfers it to a government-designated address.⁸ The user is locked out immediately.

Stablecoins are easier still. Issuers of USDT and USDC have built freeze functions into the smart contracts governing those tokens, so they can blacklist specific addresses at law enforcement’s request without needing any private key.

Once the transfer to a government wallet clears enough network confirmations, it is irreversible, and the movement is permanently recorded on the public blockchain as an auditable chain of custody. The U.S. Marshals Service manages most forfeited digital assets and has contracted with private custody firms for secure storage.⁹

What Happens to Seized Bitcoin

The Marshals Service used to auction seized Bitcoin in large public sales for U.S. dollars. Those auctions are effectively over for Bitcoin. Executive Order 14233, signed March 6, 2025, created a Strategic Bitcoin Reserve capitalized with all Bitcoin forfeited through federal criminal and civil proceedings, and the order directs that Bitcoin deposited into the reserve “shall not be sold.”¹

Non-Bitcoin digital assets go into a separate U.S. Digital Asset Stockpile, where the Treasury Secretary has discretion over management, including potential sales.¹⁰ Altcoins, stablecoins, and other tokens may still be liquidated.

The no-sale rule for Bitcoin is not absolute. The order allows disposal to return coins to identifiable crime victims, to fund law enforcement operations, and to share with state and local agencies that participated in the investigation.¹ Equitable sharing lets state and local partners receive up to 80 percent of the forfeited value depending on their role.¹¹ Proceeds from any sale under those exceptions flow into the Department of Justice Assets Forfeiture Fund, which pays for seizure operations, victim compensation, and investigative expenses.¹²

Fighting a Seizure

A seizure is not the end. Owners and third parties with a legitimate interest have specific rights, and short deadlines.

Deadlines to File

In a civil forfeiture case, you must file a verified claim identifying the property and your interest in it. The deadline appears in the personal notice letter and cannot be earlier than 35 days after mailing. If you never received direct notice, the fallback is 30 days after the government’s final publication of the seizure notice.¹³ Miss both and you lose the right to contest in court.

In an administrative forfeiture, you have 30 days from receiving the notice of seizure to file a petition for remission or mitigation. If you did not learn about the seizure before the property was forfeited, you can petition for restoration of the sale proceeds within 90 days of disposal.¹⁴

The Innocent Owner Defense

If you owned the Bitcoin before the illegal conduct, you can raise an innocent owner defense. You have to prove by a preponderance of the evidence that you either did not know about the crime or, once you learned of it, did everything reasonably possible to stop it, such as notifying law enforcement or revoking wallet access. If you acquired your interest after the crime, you have to show you were a good-faith purchaser for value with no reason to believe the property was subject to forfeiture. Someone who bought Bitcoin on an exchange at market price without knowledge of its history would generally meet that test.¹³

Excessive Fines

The Eighth Amendment’s Excessive Fines Clause applies to asset forfeitures. In Timbs v. Indiana (2019) the Supreme Court held that this protection applies to state and local forfeitures as well as federal ones.¹⁵ Earlier, in United States v. Bajakajian, the Court struck down a forfeiture as “grossly disproportionate” to the underlying offense. Courts weigh the severity of the crime, the harm caused, and the penalties authorized by statute. If the government tries to forfeit millions in Bitcoin over a relatively minor violation, this is the argument that can rein it in.

Recovering Coins as a Victim

Victim restitution takes priority over the government keeping forfeited assets. If you lost Bitcoin to fraud, hacking, or another crime that led to a federal seizure, you may be able to recover your actual coins rather than a dollar equivalent.

Victims file a petition for remission. For administrative forfeiture, the petition goes to the seizing agency; for judicial forfeiture, to the appropriate DOJ official. The petition needs documentation of your loss, such as transaction records showing the stolen funds, plus a declaration under penalty of perjury. You have to show that your loss was directly caused by the criminal conduct, that you did not knowingly participate in or benefit from the offense, and that you have not already been compensated from another source.¹⁶

Recovery is capped at your share of the net proceeds after the government deducts allowable expenses and valid third-party claims. If you later receive compensation from another source, such as a civil lawsuit, you have to reimburse the Assets Forfeiture Fund for what you received through remission.¹⁶

1
Federal Register. Establishment of the Strategic Bitcoin Reserve and United States Digital Asset Stockpile
2
Department of Justice. Bitfinex Hacker and Wife Plead Guilty to Money Laundering Conspiracy Involving Billions
3
Financial Crimes Enforcement Network. Funds Travel Rule – FinCEN Advisory
4
Office of the Law Revision Counsel. 18 USC 981 – Civil Forfeiture
5
Office of the Law Revision Counsel. 21 USC 853 – Criminal Forfeitures
6
Office of the Law Revision Counsel. 19 USC 1607 – Seizure; Value $500,000 or Less
7
Department of Justice. Application for a Warrant to Seize Property Subject to Forfeiture
8
United States District Court for the District of Columbia. Modified Order Pursuant to 28 USC 2467 and 18 USC 983
9
U.S. Marshals Service. Asset Forfeiture
10
The White House. Fact Sheet: President Donald J. Trump Establishes the Strategic Bitcoin Reserve and U.S. Digital Asset Stockpile
11
U.S. Department of the Treasury. Guide to Equitable Sharing
12
U.S. Department of Justice. Assets Forfeiture Fund (AFF)
13
Office of the Law Revision Counsel. 18 USC 983 – General Rules for Civil Forfeiture Proceedings
14
eCFR. 28 CFR 9.3 – Petitions in Administrative Forfeiture Cases
15
Supreme Court of the United States. Timbs v. Indiana, No. 17-1091
16
Forfeiture.gov. 28 CFR Part 9 – Regulations Governing the Remission or Mitigation of Administrative, Civil, and Criminal Forfeitures