Cryptocurrency and Crypto Law Attorney

Legal Services for Cryptocurrency, Bitcoin and Blockchain Matters

Arkady Bukh Law Firm represents individuals, investors, founders, technology professionals and businesses in legal matters involving cryptocurrency, blockchain networks, exchanges, digital-asset transactions and federal investigations.

Cryptocurrency law is not one isolated area of practice. A single matter may involve criminal law, financial regulation, money transmission, securities, commodities, sanctions, taxation, asset forfeiture, commercial disputes and international evidence.

The correct legal approach depends on what the client actually does:

Holds or trades cryptocurrency
Operates an exchange or payment platform
Provides hosted or non-custodial wallet services
Develops blockchain software
Issues or markets a token
Accepts and transmits digital assets
Provides staking or custody services
Receives a subpoena or government inquiry
Faces an exchange-account restriction
Disputes ownership of cryptocurrency
Is accused of fraud, money laundering or an unlicensed financial business
Conducts business with customers in the United States

The legal analysis should begin with the transaction flow, control of assets, customer relationship and actual operation of the product rather than the label used to describe it.

Choose the Appropriate Cryptocurrency Legal Service

The firm’s cryptocurrency practice includes two principal service areas.

Cryptocurrency Criminal Defense

Federal investigators may use blockchain analysis, exchange records, banking information, electronic communications and seized devices to investigate crypto fraud, money laundering, unlicensed money transmission, sanctions violations, tax offenses, cybercrime and conspiracy.

Legal representation may begin after:

A target letter
A grand jury subpoena
A request for an interview
A search warrant
A cryptocurrency seizure
A frozen exchange account
An international arrest
A federal indictment

For investigations, criminal allegations, blockchain tracing, wallet attribution, asset seizure and federal court representation, visit:

Cryptocurrency Criminal Defense Lawyer

Cryptocurrency Compliance and Blockchain Business Advice

Crypto exchanges, wallet providers, payment services, token projects and blockchain businesses may need to address federal registration, state licensing, AML and KYC controls, sanctions screening, custody, transaction monitoring and product classification.

Legal review may be needed before:

Launching a platform
Accepting U.S. customers
Taking custody of customer assets
Adding exchange or payment functions
Issuing or marketing a token
Offering staking or yield-related services
Entering New York or another regulated market
Responding to a bank or regulator
Changing the way assets are held or transmitted
Acquiring or selling a cryptocurrency business

For licensing, product review, AML, KYC, sanctions and blockchain business matters, visit:

Cryptocurrency Compliance and Blockchain Attorney

Who This Cryptocurrency Attorney Represents

Arkady Bukh Law Firm represents clients across the digital-asset industry, including:

Individual cryptocurrency holders
Bitcoin and digital-asset traders
Investors
Blockchain developers
Technology professionals
Exchange founders and executives
Wallet providers
Payment companies
Token issuers
Blockchain projects
Cryptocurrency brokers
Mining and staking businesses
Custodial service providers
Decentralized-finance projects
International crypto businesses
Companies responding to regulatory inquiries
Individuals whose digital assets have been frozen or seized
Clients facing federal criminal investigations
Parties involved in cryptocurrency ownership or transaction disputes

A cryptocurrency attorney may represent the business, an individual founder, an executive, an employee or an investor. Their interests do not always coincide.

When an investigation begins, the company and its officers may need separate representation if their legal positions differ.

Cryptocurrency Investigations

A cryptocurrency matter may develop into an investigation before the client receives direct notice.

Federal agencies can collect information from:

Cryptocurrency exchanges
Banks
Payment processors
Cloud providers
Email and messaging services
Domain and hosting companies
Blockchain analytics providers
Business partners
Employees
Customers
Foreign law-enforcement agencies

The first indication of an investigation may be:

An exchange compliance inquiry
A restricted wallet or account
A frozen bank account
A subpoena
A target letter
Contact from federal agents
A request for a voluntary interview
A search warrant
Seizure of a phone, computer or hardware wallet
A civil forfeiture complaint
Questions directed to business partners
An international arrest or extradition request

A cryptocurrency investigation should not be evaluated solely from a blockchain chart. Investigators must still connect wallet addresses, accounts, devices and transactions to identifiable people and establish the knowledge or intent required by the relevant law.

Government Agencies That May Be Involved

The agency involved depends on the activity, product and suspected violation.

A cryptocurrency matter may involve:

The Department of Justice
A United States Attorney’s Office
The Federal Bureau of Investigation
The United States Secret Service
Homeland Security Investigations
IRS Criminal Investigation
The Financial Crimes Enforcement Network
The Securities and Exchange Commission
The Commodity Futures Trading Commission
The Office of Foreign Assets Control
State financial regulators
State attorneys general
The New York Department of Financial Services
Foreign financial or law-enforcement authorities

More than one agency may investigate the same activity.

A business can face a regulatory inquiry while individual participants are being investigated for possible criminal charges. Information supplied in one proceeding may affect another.

Subpoenas, Interviews and Document Requests

A crypto business or individual may receive a request for:

Wallet addresses
Transaction histories
Exchange statements
Customer-identification records
Bank statements
Source code
Token documentation
Corporate ownership records
AML and KYC policies
Transaction-monitoring alerts
Suspicious activity records
Emails and messages
Device and login information
Contracts with customers and vendors
Marketing materials
Tax and accounting records

Before responding, counsel should identify:

Which authority issued the request
Whether the request is voluntary or compulsory
Which entities and individuals are covered
Whether the recipient is a witness, subject or target
Whether privileged information is involved
Whether the request can be clarified or narrowed
Whether foreign privacy or disclosure laws apply
Whether the company and its employees have different interests
Whether the production may affect a criminal investigation

Documents and digital records must not be destroyed, altered or concealed after an investigation or preservation obligation becomes known.

Blockchain Analysis and Wallet Attribution

Blockchain transactions may be publicly visible, but the identity and purpose behind them are not automatically established.

Investigators may attempt to attribute a wallet through:

Exchange identification records
Bank transfers
IP and login data
Files recovered from a device
Communication records
Wallet labels created by analytics providers
Transaction patterns
Customer or witness statements
Links to another identified address

Each step should be examined.

A wallet may be:

Controlled by more than one person
Used by a company rather than an individual
Managed through a multisignature arrangement
Held by a custodian
Displayed as a watch-only address
Compromised by another user
Used for customer funds
Part of an internal treasury system
Connected to an exchange deposit address
Incorrectly labelled by an analytics service

A transaction graph shows that assets moved. It does not necessarily prove who authorized the transfer, why it occurred or what that person knew about the source of the assets.

Cryptocurrency Seizure and Forfeiture

Federal authorities may attempt to restrain, seize or forfeit cryptocurrency they claim:

Represents proceeds of fraud
Was involved in money laundering
Facilitated a criminal offense
Is traceable to stolen assets
Was transferred to conceal ownership
Should be preserved for restitution
Is subject to civil or criminal forfeiture

Assets may be transferred to a government-controlled wallet or restricted through an exchange.

A seizure does not necessarily establish that the government is the final lawful owner.

The legal review may involve:

The source of the cryptocurrency
Wallet ownership
Control of private keys
Exchange-account records
Legitimate funds held with disputed assets
Rights of investors or customers
Transfers between related wallets
Blockchain tracing assumptions
Valuation dates
Notice requirements
Filing deadlines
Third-party ownership claims

Cryptocurrency values may change substantially between the date of a transaction, seizure and final court decision. The valuation method can affect forfeiture, restitution and sentencing issues.

Cryptocurrency Fraud Allegations

Cryptocurrency fraud allegations may arise from:

Token offerings
Investment platforms
Trading programs
Exchange operations
Mining projects
Staking services
Decentralized-finance products
Online marketplaces
Private investments
Cryptocurrency payment services
Wallet or custody arrangements

Prosecutors or regulators may allege:

False statements about a token or platform
Misrepresentation of reserves
Misuse of customer assets
False investment returns
Unauthorized transfers
Manipulation of prices or trading volume
Concealment of fees or conflicts
Diversion of investor funds
Fraudulent websites
Account takeover
Phishing or impersonation
False statements about custody or security

A decline in token value or failure of a business does not automatically prove fraud.

The analysis should focus on what was represented, what information was available at the time, how the assets were used and whether the client acted with fraudulent intent.

Money Laundering and Transaction Tracing

Cryptocurrency may become part of a money laundering investigation when authorities allege that digital assets represented criminal proceeds or were transferred for a prohibited purpose.

The use of several wallets does not automatically establish money laundering.

People and businesses may use multiple addresses for:

Security
Cold storage
Customer segregation
Treasury management
Exchange deposits
Trading
Multisignature control
Cross-chain transactions
Vendor payments
Refunds
Internal accounting

A tracing review may examine:

The original source of the assets
When the client received them
Who controlled each address
The commercial purpose of each transfer
Whether legitimate and disputed assets were mixed
Whether the same funds were counted several times
Whether wallet labels are reliable
What the client was told about the source of funds
Whether the transfer was automated
Whether a bridge, exchange or custody service controlled part of the route

For cases involving alleged concealment of criminal proceeds, visit the Money Laundering Defense Attorney page.

Exchanges, Wallets and Crypto Payment Services

The legal requirements for a crypto business depend on the services it actually performs.

Relevant questions may include:

Does the company accept assets from one person and send them to another?
Does it control customer private keys?
Can it approve, block or reverse withdrawals?
Does it exchange cryptocurrency for fiat currency?
Does it exchange one digital asset for another?
Does it maintain customer balances?
Does it match buyers and sellers?
Does it provide hosted or non-custodial wallets?
Does it collect transaction fees?
Does it operate a payment rail?
Does it serve customers in the United States?
Does it have customers in New York?
Does it support sanctioned or high-risk jurisdictions?

A software provider that never controls customer funds may present a different legal profile from a hosted wallet or exchange.

The legal structure should reflect the actual product rather than marketing terminology such as platform, protocol, marketplace or decentralized application.

Money Transmission and Bank Secrecy Act Issues

FinCEN distinguishes between users of convertible virtual currency and businesses acting as administrators or exchangers.

A person who acquires cryptocurrency for personal use is not automatically a money services business.

A business that accepts and transmits value or buys and sells convertible virtual currency for others may be treated as a money transmitter unless an exemption or limitation applies.

Potential obligations may include:

Registration as a money services business
A written AML program
Customer identification
Transaction monitoring
Suspicious activity reporting
Recordkeeping
Employee training
Independent testing
Designation of responsible compliance personnel

Federal MSB registration does not necessarily replace state licensing.

The legal determination depends on the service, custody structure, transaction flow and relationship with customers.

State Licensing and New York Crypto Activity

State requirements may apply separately from federal regulation.

The analysis may depend on:

Customer location
Custody of assets
Transmission of fiat currency
Transmission of cryptocurrency
Exchange activity
Payment services
Wallet control
Business structure
Supported products

Businesses conducting covered virtual currency activity involving New York may need to review New York’s BitLicense framework or another form of authorization under New York banking law.

Licensing analysis should begin before launch. A company may find it difficult to restructure custody, customer accounts and transaction flows after operations have already begun.

AML and KYC Programs

An AML and KYC program should reflect the real business.

A cryptocurrency company may need procedures addressing:

Individual customer identification
Corporate ownership
Authorized account users
Source of funds
Customer risk levels
Transaction limits
Enhanced due diligence
Blockchain-monitoring alerts
Suspicious activity escalation
Account restrictions
Record retention
Employee training
Independent testing
Periodic risk assessments

A template copied from another exchange may not fit a company’s technology, customer base or transaction flow.

Policies should identify who makes decisions, when an issue must be escalated and how the company documents the result.

Sanctions and OFAC Issues

Cryptocurrency businesses may need a sanctions-compliance program suited to their services, customers and geographic exposure.

Sanctions screening may involve:

Customer names
Company ownership
Wallet addresses
IP information
Location data
Transaction counterparties
Payment details
Blockchain exposure
Changes to sanctions lists

A potential blockchain connection to a sanctioned address requires analysis.

Indirect exposure does not necessarily establish that the customer controlled the sanctioned wallet or knowingly transacted with a blocked person. The company should understand the alert before restricting assets, closing an account or submitting a report.

A sanctions issue may also arise during a federal criminal investigation or asset-freezing matter.

For related representation, visit the Sanctions Law Attorney page.

Token and Product Classification

The word “crypto” does not determine the legal treatment of an asset or service.

Relevant factors may include:

Rights attached to the token
How the token is issued
How it is marketed
Promises made to purchasers
Expected use of the asset
The role of a promoter or management team
Custody arrangements
Trading functionality
Profit-sharing rights
Governance rights
Redemption rights
Staking or yield features
Whether the product involves derivatives

A crypto asset may not itself be a security, while a transaction or arrangement involving that asset may still fall under federal securities laws.

Certain non-security crypto assets may be treated as commodities under applicable commodities law. Derivatives, leveraged transactions and trading venues may raise additional CFTC issues.

The analysis should be based on the product’s actual rights, representations and operation.

Token Offerings and Project Launches

A token project should be reviewed before public marketing or distribution.

The review may address:

Token functionality
Rights of holders
Allocation to founders and investors
Vesting arrangements
Marketing statements
Fundraising terms
Use of proceeds
Governance
Secondary trading
Customer restrictions
Geographic limitations
Custody
Staking
Disclosures
Contractual terms

Calling a token a utility token does not determine its legal treatment.

The project should also consider whether adding later functions — such as trading, custody, yield or payment services — changes the regulatory analysis.

Cryptocurrency Disputes

Not every cryptocurrency matter involves a regulator or criminal allegation.

Disputes may concern:

Ownership of a wallet
Control of private keys
Failed token transactions
Exchange-account restrictions
Frozen withdrawals
Lost or transferred assets
Partnership disagreements
Smart-contract performance
Token-sale agreements
Mining or staking arrangements
Custody failures
Misrepresentation
Breach of contract
Investor rights
Business ownership
Payment obligations

The evidence may include:

Blockchain records
Exchange data
Wallet files
Contracts
Emails and messages
Corporate records
Source code
Governance votes
Bank records
Device evidence

A blockchain transaction may be irreversible from a technical standpoint while still creating legal claims concerning ownership, fraud, authorization or contractual liability.

Exchange Account Freezes and Compliance Reviews

An exchange may restrict an account because of:

A compliance alert
A law-enforcement request
A subpoena
A seizure warrant
Sanctions screening
Suspected account compromise
Source-of-funds questions
Transaction-monitoring results
A dispute over identity or ownership

Before submitting a lengthy explanation, the account holder should determine the likely basis of the restriction.

Relevant records may include:

Account statements
Transaction history
Support tickets
Source-of-funds documents
Wallet ownership evidence
Bank records
Contracts
Tax and accounting records
Communications concerning disputed transfers

An exchange compliance review and a government seizure are different processes. The available response depends on who imposed the restriction and under what authority.

Cryptocurrency Tax and Reporting Issues

Digital-asset transactions may create federal, state and international tax or reporting questions.

Relevant activity may include:

Purchases and sales
Token swaps
Mining
Staking
Payments for services
Compensation
Airdrops
Business revenue
Foreign accounts
Transfers between personal and business wallets
Losses from theft or fraud

Tax records may also become evidence in a civil or criminal investigation.

The legal team may need to coordinate with qualified tax and accounting professionals to reconstruct transactions, determine ownership and review prior reporting.

A missing or incorrect filing should not be addressed without considering whether an examination or criminal investigation is already underway.

International Cryptocurrency Matters

Digital assets routinely cross national borders.

A matter may involve:

A foreign client
A U.S. exchange
A foreign exchange
Customers in several countries
Servers outside the United States
International bank transfers
Stablecoin issuers
Foreign corporate structures
Sanctions
Extradition
Evidence collected abroad
Parallel investigations

Legal issues may include:

S. jurisdiction
Foreign licensing
Location of customers
Location of servers and assets
Access to foreign records
Translation
Authentication of evidence
International data requests
Travel and arrest risk
Extradition
Rule-of-specialty issues after surrender

A foreign company may need U.S. legal advice even without an office in the United States if its services, customers, transactions or marketing create a sufficient U.S. connection.

Cryptocurrency and Cybercrime

A cryptocurrency matter may overlap with cybercrime when the allegations involve:

Hacking an exchange or wallet
Stealing private keys
Phishing
SIM swapping
Account takeover
Malware
Ransomware
Unauthorized access
Compromised devices
Stolen authentication codes

The defense may need to examine both blockchain evidence and digital evidence from devices, providers and online accounts.

Control of a wallet should not be inferred solely from the presence of an application or seed phrase on a device. The application may contain shared, imported, custodial or watch-only accounts.

For allegations involving hacking, unauthorized access and seized devices, visit the Federal Cyber Crime Defense Attorney page.

Securities and Investment Allegations

Crypto projects may face allegations involving:

Misleading token marketing
False statements about returns
Misuse of investment funds
Undisclosed compensation
Market manipulation
Insider trading
False statements about reserves
Misleading financial reports
Unregistered offerings
Trading-platform activity

The legal analysis may involve the asset, the transaction, the marketing and the relationship between the project and purchasers.

For investigations involving SEC proceedings, token investments or market manipulation, visit the Investment and Securities Fraud Defense Attorney page.

What Is Cryptocurrency?

Cryptocurrency is a digital representation of value that is generated, recorded or transferred through blockchain or similar distributed-ledger technology.

Crypto assets may include:

Bitcoin
Stablecoins
Network-native tokens
Governance tokens
Utility tokens
Tokenized financial instruments
Digital collectibles
Assets used in decentralized applications

Not every crypto asset is structured in the same way.

Some networks operate without a central issuer. Other digital assets may be issued, managed, redeemed or controlled by a company or identifiable group. Some assets are designed primarily for payments, while others provide access, governance, investment or contractual rights.

The term cryptocurrency is often used broadly even when the asset does not function like traditional currency.

The legal treatment therefore depends on the asset and activity rather than on a universal definition.

How Cryptocurrency Law Works in the United States

There is no single federal cryptocurrency license or one regulator responsible for every digital-asset activity.

Different laws may apply depending on:

Whether the asset is a security or commodity
Whether the business accepts or transmits value
Whether customer assets are held in custody
Whether derivatives are offered
Whether customers are located in regulated states
Whether the transaction involves a sanctioned person or jurisdiction
Whether the activity creates tax obligations
Whether fraud or criminal conduct is alleged
Whether the company provides banking, payment or investment services

A project may therefore need to consider several regulatory systems at the same time.

The appropriate analysis maps each function of the product to the authority that may regulate it.

Relevant Experience in a Cross-Border Cryptocurrency Case

Arkady Bukh Law Firm represented Alexander Vinnik in proceedings connected with the BTC-e cryptocurrency exchange.

The matter involved allegations concerning cryptocurrency transactions, money laundering and an international prosecution that extended across several jurisdictions.

The case illustrates the issues that may arise in a large digital-asset matter:

Blockchain and exchange records
Cross-border transactions
Extradition
Federal criminal charges
Wallet attribution
International evidence
Cryptocurrency valuation
Government seizure
Diplomatic developments

Additional information is available in the firm’s published Alexander Vinnik case summary.

Past results do not guarantee a similar result in another matter. Every cryptocurrency case depends on the specific transactions, documents, allegations and procedural history.

Bukh Law Firm Cryptocurrency Legal Services

Cryptocurrency Criminal Defense

Representation in federal investigations involving fraud, money laundering, unlicensed money transmission, cybercrime, sanctions and related charges.

Crypto Compliance and Licensing

Review of federal MSB obligations, state licensing, New York requirements and compliance controls.

Exchange and Wallet Advice

Legal analysis for custodial and non-custodial wallets, exchanges, brokers and payment services.

AML and KYC Programs

Development and review of customer identification, monitoring, reporting, training and testing procedures.

Sanctions Compliance

Review of customers, wallets, transaction exposure and procedures for handling potential sanctions matches.

Token and Product Review

Analysis of token functionality, offerings, staking, custody, trading and product changes.

Government Investigation Response

Representation involving subpoenas, interviews, search warrants, exchange inquiries and regulatory requests.

Blockchain and Transaction Analysis

Review of wallet attribution, transaction paths, exchange data and blockchain analytics.

Asset Seizure and Forfeiture

Representation concerning frozen accounts, seized cryptocurrency, third-party claims and tracing disputes.

Cryptocurrency Disputes

Representation in ownership, contract, exchange, investment, partnership and transaction disputes.

International Crypto Matters

Coordination involving foreign clients, international evidence, sanctions, travel risk and extradition.

When to Contact a Cryptocurrency Attorney

Legal advice may be needed when:

A cryptocurrency exchange freezes an account
A bank closes or restricts an account
A company receives a regulator’s inquiry
A subpoena requests wallet or customer data
Federal agents request an interview
Devices or digital assets are seized
A client receives a target letter
A token project plans to enter the U.S. market
A business intends to serve New York customers
A platform adds custody, exchange or payment services
A dispute arises over wallet ownership
A foreign client faces U.S. charges or travel risk
A compliance issue may develop into an investigation

Arkady Bukh Law Firm advises clients on cryptocurrency investigations, compliance, exchanges, blockchain transactions, disputes and related federal proceedings.

Cryptocurrency Law FAQ

What type of lawyer handles cryptocurrency matters?

A cryptocurrency attorney may handle criminal investigations, regulatory compliance, exchange licensing, token questions, asset seizure, blockchain evidence and commercial disputes. The appropriate lawyer depends on the problem rather than the name of the asset.

Is Arkady Bukh a cryptocurrency lawyer?

Yes. Arkady Bukh Law Firm represents individuals and businesses in cryptocurrency investigations, federal criminal matters, compliance questions and blockchain-related disputes.

Does the firm represent Bitcoin clients?

Yes. The cryptocurrency practice includes matters involving Bitcoin and other digital assets, including transactions, exchanges, wallets, investigations and ownership disputes.

What is the difference between the cryptocurrency hub and the criminal defense page?

This page provides an overview of the firm’s digital-asset services. The criminal defense page focuses specifically on federal investigations, indictments, wallet attribution, blockchain evidence, seizure and criminal charges.

What is the difference between the hub and the compliance page?

The compliance page focuses on exchanges, wallets, payment platforms and blockchain businesses that need assistance with licensing, AML, KYC, sanctions and product regulation.

Are all cryptocurrencies securities?

No. The legal treatment depends on the asset and transaction. A crypto asset may not itself be a security, while an offering, investment contract or product involving it may still fall within federal securities laws.

Are all cryptocurrencies commodities?

No single classification applies to every crypto asset and every transaction. Certain non-security crypto assets may be treated as commodities, while other products may raise securities, derivatives, banking or money-transmission issues.

Does a crypto exchange need a federal license?

There is no single universal federal crypto license. Depending on its activities, a business may need FinCEN registration, state licenses or authorization from other regulators.

Does FinCEN regulate cryptocurrency businesses?

FinCEN applies Bank Secrecy Act rules to certain cryptocurrency businesses. A business acting as an administrator or exchanger may be treated as a money transmitter depending on what it actually does.

Does federal registration allow a crypto business to operate in every state?

Not necessarily. Federal MSB registration does not replace state money-transmitter or virtual-currency licensing requirements.

Can cryptocurrency be seized by the government?

Yes. Federal authorities may seek to restrain or seize digital assets they allege are proceeds, facilitated an offense or are subject to forfeiture. The owner may have rights to challenge the seizure or assert an ownership claim.

Does a blockchain transaction prove who owned the cryptocurrency?

Not by itself. Investigators may use exchange records, devices, login data, communications and bank transfers to connect an address with a person. Each part of that attribution may be examined.

Can a cryptocurrency account be frozen without criminal charges?

An exchange may restrict an account during a private compliance review, and government authorities may seek restraints through civil, administrative or criminal procedures. The appropriate response depends on the reason and legal authority for the restriction.

Can a foreign crypto company be subject to U.S. law?

Potentially. U.S. jurisdiction may depend on customers, transactions, marketing, infrastructure, financial institutions and the effects of the company’s conduct in the United States.

When should a crypto business obtain compliance advice?

Legal review is most useful before launch, before accepting U.S. customers and before adding custody, payment, exchange, token, staking or other regulated functions.

Can a compliance issue become a criminal investigation?

Yes. Questions involving licensing, transaction monitoring, customer verification or suspicious activity may develop into regulatory or criminal inquiries depending on the circumstances.

Does a failed crypto project automatically constitute fraud?

No. A project may fail because of market, technical, financial or business problems. Fraud generally requires proof of the elements of a specific offense, including the required intent.

What should I do after receiving a cryptocurrency subpoena?

Preserve all relevant records and determine which authority issued the subpoena, what information is requested and whether a criminal or parallel investigation may be underway before producing documents or giving testimony.