Yes, U.S. courts can freeze or secure cryptocurrency before judgment, but relief depends on the forum state’s attachment law as applied through Federal Rule of Civil Procedure 64 and on pleading an equitable predicate that gets around purely monetary limits. The immediate task is preserving wallet addresses, transaction histories, and exchange account identifiers while drafting an affidavit that supports emergency relief. Ex parte freezes are possible in the right facts, but courts scrutinize them closely and often require a bond.
TL;DR:
- Courts require concrete, up-to-date chain evidence such as transaction hashes and wallet addresses to justify ex parte freezes of cryptocurrency.
- The applicable attachment law depends on the state where the court sits, with each jurisdiction having specific requirements and quick post-attachment hearing deadlines.
- Plaintiffs typically plead equitable claims like replevin or injunctive relief, focusing on transfers to unhosted wallets or suspicious activity to persuade courts for emergency orders.
- Effective tracing involves blockchain analysis, subpoenas to exchanges, and real-time monitoring, with exchange KYC records often helping identify defendants faster.
- Cryptocurrency held on decentralized exchanges or privacy coins faces significant hurdles for attachment, requiring fallback legal strategies against defendant control or assets beyond direct freeze measures.
Table of Contents
- Legal framework: FRCP 64, Rule B, and state-law variation
- When courts will freeze or attach crypto: predicates and claims that unlock equitable relief
- Step-by-step procedural checklist to obtain a TRO/prejudgment attachment for crypto
- Preserve and identify crypto holdings: forensics, subpoenas, and monitoring
- Post-attachment enforcement: receiverships, marshals, conversion, and pitfalls
- Defenses and due-process constraints courts consider
- Practitioner perspective and Murphy’s Law capabilities
- Jurisdictional challenges unique to prejudgment attachment of crypto assets
- Risks and limitations of prejudgment attachment in the context of decentralized exchanges and privacy coins
- Considerations for cross-border enforcement and international cooperation in crypto asset attachment
- Author’s closing takeaways and three practical rules
- Murphy’s Law: services for crypto preservation and recovery
- Sources
- FAQ
Legal framework: FRCP 64, Rule B, and state-law variation
Federal courts do not have one uniform crypto attachment statute. Instead, Federal Rule of Civil Procedure 64 directs federal courts to borrow the seizure remedies available under the law of the state where the court sits, meaning the actual mechanics of a prejudgment attachment against a crypto holder in New York look different from one filed in Florida or California. That single fact drives most of the early strategy in these cases: before drafting anything, counsel needs to know which state’s attachment statute applies and what factual showing that statute demands.
In admiralty and certain in personam actions, Rule B offers a separate track, allowing attachment of tangible or intangible property, including arguably digital assets, when a defendant cannot be found within the district. Rule B carries its own affidavit and exigent-circumstance requirements and has been used creatively in disputes touching maritime or admiralty jurisdiction where a defendant’s crypto holdings are the only reachable asset.
A forum-selection checklist for practitioners should include:
- Confirm which state’s attachment statute governs under FRCP 64 and read its specific grounds for prejudgment relief.
- Check whether the defendant or the crypto itself has any connection to a district where Rule B might apply.
- Identify the state’s bond requirement and notice exceptions before filing.
- Map the deadline for a post-attachment hearing, since most state statutes require one quickly after an ex parte order issues.
When courts will freeze or attach crypto: predicates and claims that unlock equitable relief
Plaintiffs pursuing prejudgment control of cryptocurrency generally plead equitable claims such as replevin, injunctive relief, or constructive trust rather than resting on a pure damages theory, because a purely monetary claim runs into limits on prejudgment equitable relief recognized under federal practice. The FIU Law Review explains that plaintiffs commonly turn to these equitable theories specifically because monetary claims restrict access to freeze orders, and courts look for a tight nexus between the specific coins at issue and the alleged wrongdoing.
Certain fact patterns tend to persuade judges that emergency relief is warranted:
- Evidence of transfers to unhosted wallets shortly after the plaintiff demanded return of funds.
- Unexplained withdrawals from a custodial exchange account that coincide with litigation threats or service of process.
- Transfers routed through mixers, foreign exchanges, or jurisdictions with weak cooperation on civil discovery.
- A defendant who has gone silent, ignored preservation letters, or refused to identify wallet ownership.
Recent U.S. litigation illustrates how courts apply these principles when cryptocurrency is the disputed asset, including matters such as Handley v. La Melza and the Morozov line of cases, along with disputes touching the Winklevoss twins’ crypto holdings, all of which involved courts wrestling with how to secure digital assets that can move across borders in seconds. The common thread in these matters is that judges want concrete, contemporaneous chain evidence, not speculation, before they will order a freeze.
Step-by-step procedural checklist to obtain a TRO/prejudgment attachment for crypto
A motion for emergency relief in a crypto case succeeds or fails on the specificity of the supporting record. Courts want to see wallet addresses, the relevant chain (Bitcoin, Ethereum, or another network), specific transaction hashes, and evidence tying the defendant to control over those addresses. General allegations that “the defendant has crypto somewhere” will not clear the bar for an ex parte order.
- Draft a verified complaint identifying every known wallet address, exchange account, and transaction relevant to the alleged fraud or breach.
- Attach an affidavit detailing concealment efforts, unexplained transfers, or the defendant’s failure to respond to preservation demands.
- Certify exigent circumstances explaining why notice to the defendant before relief would defeat the purpose of the order.
- Confirm the clerk’s issuance mechanics in the forum state, since some jurisdictions require a judge’s signature same day while others route through a duty clerk.
- Prepare bond language and be ready to post security, since most states condition an attachment on the plaintiff’s ability to cover wrongful-attachment damages.
- Draft narrow relief: preservation of specific addresses, disclosure of private keys only to a court-appointed receiver, or turnover to a custodial escrow rather than a broad freeze on “all defendant’s crypto assets.”
Firms that handle TRO practice and preliminary injunction motions for crypto disputes typically build these filings around a tight factual record rather than broad language, since overbroad orders invite immediate challenge and slow down the case.
Pro Tip: File the preservation letter to the exchange the same day you file the emergency motion, since exchanges routinely require a court order in hand before they will lock an account.
Preserve and identify crypto holdings: forensics, subpoenas, and monitoring
Locating and freezing crypto before it moves requires a mix of blockchain analysis and traditional discovery tools moving on parallel tracks.
- Map the defendant’s known wallet addresses against public blockchain explorers to trace inbound and outbound transfers, then flag any addresses that touch known custodial exchange deposit addresses.
- Send preservation letters and subpoenas to major U.S. exchanges as early as possible, since the HLC judgment enforcement practice note observes that courts have ordered wallet disclosure and transfers to marshals once custodial accounts are identified, but only after plaintiffs moved quickly enough to catch the funds before withdrawal.
- Engage blockchain-forensic analytics to link pseudonymous addresses to identifiable custodians, a step that turns raw chain data into evidence a court can act on.
- Build a monitoring script or retain a vendor to watch flagged addresses for movement, since a single transfer during litigation can moot the entire attachment strategy.
The firm’s own blockchain investigations work follows this same sequence: trace first, then subpoena, then monitor, because forensic output only has value if it reaches the court before the coins move again. Understanding what blockchain forensics reveals about stolen crypto also shapes how an affidavit should be written, since raw transaction data means little to a judge without plain explanation of what it shows.
Pro Tip: Request exchange KYC/AML records alongside transaction subpoenas, since the exchange’s own account-opening documents often identify the defendant faster than chain analysis alone.
Post-attachment enforcement: receiverships, marshals, conversion, and pitfalls
Winning the motion is only the first half of the problem. Courts have increasingly ordered receiverships or custodial arrangements that give a neutral party control of private keys, since a broad freeze order is nearly impossible to police against a defendant who still holds the keys.
- Receivership: a court-appointed receiver takes custody of private keys or exchange credentials and can execute transfers under court supervision.
- Marshal transfer: some orders direct a defendant or exchange to move specific crypto to a U.S. Marshals-controlled account or custodial escrow pending judgment.
- Conversion to cash: courts sometimes order liquidation of volatile holdings into a stable custodial account to prevent value loss before trial.
- Priority and perfection: as the Lexology summary on digital asset attachment explains, possession or control of crypto is often more protective than mere registration, and the 2022 UCC amendments affect how priority is established for tokenized instruments.
- Common failure point: defendants who control their own keys and refuse to cooperate can render even a signed order unenforceable absent contempt sanctions.
Defenses and due-process constraints courts consider
Ex parte attachment of crypto sits close to the constitutional line drawn by Sniadach v. Family Finance Corp. and Fuentes v. Shevin, both of which caution against depriving a party of property without notice and a hearing absent a strong exigent showing. Courts weigh that concern heavily against a plaintiff’s urgency argument.
- Defendants commonly argue disputed ownership of the wallet, an adequate legal remedy at law, or that the requested order is vague or overbroad.
- Overbroad language covering “any and all cryptocurrency” invites immediate challenge and often gets narrowed or vacated at the first hearing.
- Plaintiffs improve their odds by tailoring relief to specific addresses, offering a meaningful bond, and scheduling a prompt post-attachment hearing rather than resisting one.
Practitioner perspective and Murphy’s Law capabilities
Liam Murphy, Esq., a graduate of Penn Law who previously practiced at Paul Hastings, Selendy Gay, and McKool Smith, built Murphy’s Law around litigating exactly these fact patterns, with an active docket touching matters involving Celsius, Terraform Labs, and BitMEX. That courtroom background shapes how the firm sequences emergency crypto matters.
- Tracing and forensic work starts before the complaint is drafted, so the affidavit already has chain evidence attached.
- Subpoenas to exchanges go out in parallel with the emergency motion rather than after a hearing, saving days that matter when coins can move instantly.
- Private-key material, when a receiver takes custody, is handled under strict evidentiary and ethical guardrails to preserve chain of custody for later enforcement.
Jurisdictional challenges unique to prejudgment attachment of crypto assets
Cryptocurrency does not sit in a physical location the way a bank account or a car does, which complicates the basic jurisdictional question of where the “property” actually is for attachment purposes. Courts have taken different approaches, some treating the situs of a crypto asset as the domicile of the account holder or the location of the custodial exchange, others focusing on where the private keys or the controlling party can be found.
That uncertainty matters because FRCP 64 ties the available remedy to state law, and a state’s attachment statute may assume the property being seized has a fixed physical or record location. When the asset is a noncustodial wallet with no exchange intermediary, plaintiffs sometimes cannot point to any single jurisdiction that clearly has authority over the coins, which pushes counsel toward personal jurisdiction over the defendant instead of jurisdiction over the asset itself.
Multi-district disputes add another layer: a defendant might reside in one state, use an exchange headquartered in another, and hold assets on a blockchain with no jurisdiction at all. Practitioners need to build the jurisdictional argument around the defendant’s contacts and conduct, since arguing jurisdiction over the token itself is often a dead end. Choosing the forum with the strongest personal jurisdiction hook, rather than the forum that feels most convenient, tends to produce more durable orders that survive a motion to vacate.
Risks and limitations of prejudgment attachment in the context of decentralized exchanges and privacy coins
Attachment strategy that works cleanly against a defendant holding funds on a centralized, U.S.-registered exchange often breaks down against decentralized exchanges and privacy-focused coins. A decentralized exchange has no central custodian to serve with a subpoena or a freeze order, since trades execute through smart contracts rather than an intermediary that can be legally compelled to act.
Privacy coins and mixing services compound the problem by breaking the traceable link between sender and receiver that forensic analytics depends on. Even sophisticated blockchain-forensic vendors can struggle to produce the kind of contemporaneous transaction evidence courts expect for an affidavit when the underlying protocol is designed to obscure that trail.
The practical consequence is that plaintiffs facing a defendant who moves funds onto a decentralized platform or into a privacy coin often lose the ability to secure a meaningful freeze, and the case shifts toward pursuing the defendant personally, through contempt or judgment enforcement against other assets, rather than the crypto itself. Counsel should flag this risk early: if the fact pattern shows a defendant already comfortable using decentralized tools, the odds of a clean prejudgment freeze drop, and the litigation plan needs a backup theory of recovery.
Considerations for cross-border enforcement and international cooperation in crypto asset attachment
Crypto’s borderless movement means a meaningful share of these cases involve exchanges, wallets, or defendants outside the United States, and a domestic prejudgment order does not automatically bind a foreign custodian. Enforcing a U.S. attachment order against an overseas exchange often requires either voluntary compliance, a parallel proceeding in the foreign jurisdiction, or reliance on mutual legal assistance treaties and letters rogatory, all of which take time that a moving defendant does not need to give.
Some foreign exchanges maintain U.S. operating entities or U.S. banking relationships, which gives plaintiffs a domestic hook even when the parent company sits abroad, and counsel should check for that connection before assuming a foreign platform is out of reach. Where no domestic presence exists, plaintiffs may need local counsel in the relevant country to pursue recognition of the U.S. order or to file a parallel freeze application under that jurisdiction’s own law.
Timing matters more in cross-border cases than in purely domestic ones, since the delay inherent in international cooperation gives a defendant more opportunity to move funds through additional jurisdictions before any order takes effect. Building the emergency motion with cross-border enforcement in mind, rather than treating it as an afterthought once domestic relief is secured, tends to produce a better outcome when the defendant’s assets are not sitting neatly inside a U.S. exchange.
Author’s closing takeaways and three practical rules
Every crypto attachment case comes down to three moves done in order: trace the funds first, plead an equitable predicate that supports prejudgment control, then ask for relief narrow enough that a judge can grant it without hesitation. Most losing motions fail on one of three points: missing or vague wallet identifiers, relief drafted so broadly it invites immediate challenge, or a jurisdictional theory nobody checked before filing. When a defendant has already moved funds through a decentralized platform or a foreign exchange, that is the moment to call counsel who handles this fact pattern regularly rather than treating it as a standard collections matter.
— Mark
Murphy’s Law: services for crypto preservation and recovery
Waiting even a few days to trace a wallet or file for emergency relief can be the difference between recovering funds and watching them disappear across another exchange. Murphy’s Law handles cryptocurrency preliminary injunctions and temporary restraining orders alongside blockchain forensic investigations, pairing courtroom litigation experience with the tracing work these motions require. If you are a fraud victim or a plaintiff weighing emergency relief, visit Murphy’s Law to discuss your case and the fastest path to securing the assets at stake.
This article is general information, not a substitute for advice from a qualified lawyer. Consult a qualified legal professional about your own circumstances before acting on anything here.
Sources
- Rule 64. Seizing a Person or Property | Federal Rules of Civil Procedure | LII / Cornell Law
- The Challenges of Cryptocurrency Asset Recovery | FIU Law Review
- Judgment enforcement in the new age of digital assets | HLC
- Attachment of digital assets: crypto-currencies (Lexology summary)
FAQ
What is a prejudgment attachment?
A prejudgment attachment is a court order that secures a defendant’s property, including bank accounts or, in crypto cases, wallet holdings, before a final judgment is entered, so the asset is still available if the plaintiff wins. Under FRCP 64, federal courts apply the forum state’s own attachment statute to determine the procedure and grounds for granting one.
Are prejudgment attachments constitutional?
Prejudgment attachments are constitutional but face due-process limits, particularly when sought without notice to the defendant, under the framework set out in cases like Sniadach v. Family Finance Corp. and Fuentes v. Shevin. Courts require a strong factual showing of exigent circumstances and often a bond before granting relief ex parte.
What are the new laws on cryptocurrency in the US?
There is no single new federal statute governing crypto attachment: courts continue to apply existing rules like FRCP 64 and state attachment law, adapting them to digital assets on a case-by-case basis. The 2022 UCC amendments affect how perfection and priority work for certain tokenized instruments once a court secures them.
What is a prejudgment attachment in New York?
In New York, prejudgment attachment follows the state’s own attachment statute, applied in federal court through FRCP 64, and generally requires the plaintiff to show grounds such as a defendant’s intent to dispose of assets or removal of property from the state. As with other states, New York courts expect a detailed affidavit and typically require a bond before issuing the order.