Decentralized applications (dapps) may qualify as money transmitters under U.S. law in certain circumstances, the nation's anti-money-laundering (AML) regulator said.

The Financial Crimes Enforcement Network (FinCEN) published a new guidance sheet Thursday, outlining when and how different companies, individuals and platforms in the crypto space may be money transmitters under the Bank Secrecy Act (BSA) and other relevant laws. The document highlighted dapps among other models.

Being designated a money transmitter under FinCEN rules means a firm or person must follow federal AML and know-your-customer (KYC) regulations.

In Thursday's notice, the U.S. Treasury Department's AML bureau said that while it "does not establish any new regulatory expectations or requirements," it does combine several previous documents issued over the past eight years, and details in greater specificity how participants in the space might violate AML regulations.

Dapps, the document noted, are "designed such that they are not controlled by a single person or group of persons," meaning there is no single entity operating as the dapp's administrator.

However, if a dapp "accept[s] and transmit[s] value," it qualifies as a money transmitter under the same regulatory interpretation applied to crypto-dispensing vending machines, FinCEN said.

The guidance said:

However, the developers behind a dapp – even a dapp specifically designed to issue cryptocurrencies or at least facilitate financial services in crypto – do not qualify as money transmitters until the dapp is put into use.

Users of a dapp may also fall under FinCEN regulations, the guidance said. Any investors or operators of a dapp who use it to transfer funds would be classified as money transmitters themselves.

Other aspects of the document could have far-reaching impacts, touching on crypto payment processors as one example.

Non-hosted wallets (such as Blockchain.com), meaning those where users control their funds, are exempted from possible money transmitter classifications but hosted online wallets (such as Coinbase, which holds the private keys for customers' funds) are not.

There are some other exemptions as well: any person who provides support services to a money transmitter, acts as a payment processor for a good or service (that isn't specifically money transmission) or acts as an intermediary between BSA-regulated institutions does not qualify as money transmitters.

Some decentralized exchanges (DEXs), if they only match buyers with sellers but do not touch any cryptocurrency (or fiat) during the transaction, would also be exempted from a money transmitter designation.

However, payment processors which convert crypto to fiat and vice versa at the point of sale do not get the exemption usually granted to processors that only facilitate the purchase of goods and services, FinCEN said.

That's because traditional processors only work with financial institutions that are regulated under the BSA. Such institutions "have greater visibility into the complete pattern of activities" of the buyer and the seller, FinCEN said, but when a payment processor is using crypto rails, "this visibility simply does not exist ... unless the [crypto] payment processor complies with the reporting obligations of a money transmitter."

Individuals, platforms and companies that do not fall under a federal exemption are required to register with FinCEN as a money services business (MSB), develop anti-money laundering programs and report currency transactions, as well as any suspicious activity.

Those who fail to do so run the risk of being fined and charged with a misdemeanor or felony, according to the Legal Information Institute.

UPDATE (May 10, 2019, 00:40 UTC): This article originally indicated that state licensing requirements were a factor in money transmitter designations. With regard to FinCEN and its guidance, they are not.

FinCEN image via Shutterstock