Digital currencies can help investigators catch cybercriminals because many blockchain transactions leave a public, persistent trail. That trail can show where stolen or ransom funds moved; exchange records, device evidence, legal process and other police work can help connect those movements to people. In the 2021 Colonial Pipeline case, investigators traced funds paid to the DarkSide ransomware group and seized 63.7 bitcoin, valued at about $2.3 million at the time.
Why a public ledger can help investigators
Many cryptocurrencies are pseudonymous, not anonymous. A blockchain may show wallet addresses and transfers without displaying the owners’ legal names. The transaction record and the identity behind an address are separate questions.
For a transparent blockchain such as Bitcoin, confirmed historical transactions are generally visible long after they occur. Investigators can use the ledger as a financial graph: starting with a known address, they follow transfers, look for patterns and identify points where funds reach a service that may hold customer records. The U.S. Department of Justice describes blockchain tracing as one part of its cybercrime strategy (DOJ’s strategic approach to countering cybercrime).
That visibility does not make every transaction easy to interpret, and it does not mean every type of digital currency exposes the same information. Investigators still have to determine what an address represents, whether multiple addresses share control, and who—if anyone—can be tied to that control.
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How investigators follow the money
- Start with a known address or transaction. A victim may have a ransom address, a transaction ID, or a wallet used in a fraud. This starting point gives investigators something specific to search.
- Reconstruct the transfers. Analysts examine incoming and outgoing transactions and map where funds moved, including through intermediary addresses.
- Look for related addresses and services. Transaction patterns can suggest that addresses are controlled by the same entity or used by a known service. These are investigative leads, not proof of a person’s identity.
- Find potential off-ramps. Funds may reach a cryptocurrency exchange, hosted wallet, payment processor, gambling site, marketplace or other service. Investigators may seek records from those providers.
- Compare the ledger with other evidence. Relevant evidence can include account registration details, login and device records, bank links, communications, victim reports, seized devices and infrastructure data.
- Seek legal action where the evidence supports it. Investigators may pursue warrants, freezes, seizures, arrests or forfeiture, subject to applicable law and court process.
Basic block explorers can show public transactions, but they generally do not establish who controls an address or identify every service in a transaction path. Specialist blockchain-intelligence platforms add clustering, labels, graph views and cross-chain analysis. DOJ has described the use of commercial tracing tools in investigations; a court filing in the ChipMixer case, for example, discusses assistance from an analytics company identified as “Company A” (DOJ ChipMixer filing).
What the Colonial Pipeline seizure shows
After the May 2021 ransomware attack on Colonial Pipeline, the company reported paying approximately 75 bitcoin. On June 7, 2021, the Justice Department announced that it had seized 63.7 bitcoin connected to the ransom, then valued at approximately $2.3 million. The department said investigators followed transfers on Bitcoin’s public ledger to an address and that the FBI obtained the private key associated with it (DOJ announcement; U.S. Attorney’s Office account).
The case illustrates a sequence: a ransom payment created a known starting point; public transaction data showed subsequent movements; investigators identified an address holding funds; and access to its private key enabled the seizure. The government recovered a significant portion of the reported payment, not the entire ransom. The historical dollar valuation was specific to the announcement date and should not be treated as a current value.
Why exchanges and other services matter
A blockchain address usually does not contain a name. A custodial exchange or hosted-wallet provider, by contrast, may hold information that connects an account to a customer. Depending on the provider and the law governing a request, records may include:
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- Account registration and identity-verification documents.
- Login times, IP addresses and device information.
- Deposit and withdrawal histories.
- Linked bank accounts or payment methods.
- Customer-support communications and account actions.
These records can help bridge the gap between a transaction and a person. Criminals may try to avoid that point by using mixers, peer-to-peer trades, offshore services or multiple chains. Those tactics can complicate an investigation, but they do not guarantee that the funds or the people handling them cannot be identified.
The DOJ’s National Cryptocurrency Enforcement Team focuses on criminal misuse of digital assets and the services that can facilitate it, including exchanges, mixers and infrastructure providers (NCET).
How investigators handle mixers, bridges and chain hopping
A mixer or tumbler is designed to make the relationship between the source and destination of funds harder to see. Chain hopping means moving assets between blockchains or converting them into other tokens. A bridge transfers assets, or representations of them, between blockchain networks. These methods add complexity; they do not automatically erase every useful clue.
Investigators may look for known service addresses, timing and amount patterns, repeated behavior, address reuse, or funds that later converge at an exchange. A “peel chain,” for example, is a pattern in which smaller amounts are repeatedly separated while the remainder continues onward. Recognizing such patterns requires analysis and does not, on its own, identify a human suspect.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchIn 2023, the Justice Department announced the takedown of ChipMixer, alleging that the service processed more than $3 billion in unlawful transactions. That figure was an allegation in the enforcement action, not an estimate of all cryptocurrency crime (DOJ ChipMixer announcement).
How tracing supports disruption and asset recovery
Tracing can serve purposes beyond identifying an attacker. Authorities may use it to locate funds for a freeze or seizure, link separate cases, warn service providers about suspicious deposits, or disrupt a laundering operation. A seizure does not automatically mean victims will be reimbursed; asset return or forfeiture involves separate legal steps.
A longer-running example is Helix, a darknet cryptocurrency mixer. In January 2026, DOJ announced that the United States obtained legal title to more than $400 million in assets tied to Helix, including cryptocurrency, real estate and monetary assets. The department said Helix had processed more than $300 million in cryptocurrency transactions (DOJ announcement; U.S. Attorney’s Office account).
Investigations can cross borders because victims, wallets, service providers and suspects may be in different countries. In Europol’s Project A.S.S.E.T., authorities reported identifying 83 cryptocurrency addresses and wallets and freezing about €200,000 in cryptocurrency as part of a broader effort to identify criminal assets (Europol Project A.S.S.E.T.).
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Where blockchain evidence has limits
Following funds is not the same as proving who controlled a wallet or committed a crime. Investigators need to build each link in the chain of attribution with appropriate evidence:
- Transaction: funds moved from one address to another.
- Service: an address is associated with an exchange, mixer or other provider.
- Entity: several addresses appear to be controlled by the same service or organization.
- Person: evidence connects a named individual to an address, account or service.
- Offense: evidence supports that the person committed or knowingly facilitated the underlying crime.
Each step requires more than a transaction graph alone. Automated labels and risk scores can be useful leads, but they are not verdicts. A public interaction with an address associated with a service does not necessarily prove that a person knowingly participated in that service’s activity.
Tracing can also become harder when funds move rapidly through multiple services, cross-chain swaps, privacy-focused systems, peer-to-peer markets or noncooperative providers. Different blockchains expose different amounts of data, so a conclusion about Bitcoin should not be generalized to every digital currency. Privacy-enhancing systems can reduce the usefulness of ordinary public-ledger analysis, while leaving other evidence—such as records, devices, communications or operational mistakes—available to investigators.
What victims and organizations should preserve
For ransomware or crypto fraud, prompt reporting can give investigators a useful starting point before funds are dispersed. Preserve the evidence in its original form and share it with law enforcement and qualified incident-response or legal professionals.
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- Ransom notes, emails, chats and account messages.
- Dates and times, including time zone where known.
- Exchange, wallet or payment-service account details and relevant notifications.
- Incident-response records and any communications with the suspected attacker.
Do not assume a public block explorer can identify a criminal, and do not treat tracing or recovery claims as guarantees. Avoid sharing wallet seed phrases or handing over control of funds to a person promising recovery. Ransom payments can also raise legal, sanctions, insurance and regulatory issues, so organizations should consult qualified professionals rather than attempting to confront or investigate attackers on their own.
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