Is a mining pool a money transmitter? FinCEN's §5.4 rule, explained

01 The 2013 framework: user, exchanger, administrator

FinCEN administers the Bank Secrecy Act. Its interest in a mining pool is a single question: is the pool operator a "money transmitter", which is one kind of money services business (MSB) and carries registration, anti-money-laundering programme, recordkeeping and reporting obligations. The definition sits at 31 CFR 1010.100(ff)(5): a person that provides money transmission services, meaning "the acceptance of currency, funds, or other value that substitutes for currency from one person and the transmission of currency, funds, or other value that substitutes for currency to another location or person by any means".

FinCEN's first guidance on convertible virtual currency (FIN-2013-G001, March 2013) sorted participants into three roles. A user obtains virtual currency to buy goods or services for their own purposes; a user is not an MSB. An exchanger exchanges virtual currency for real currency or other virtual currency as a business. An administrator issues virtual currency and has the authority to redeem it. Exchangers and administrators are money transmitters unless an exemption applies.

That framework is why every later question about mining starts the same way: is the person mining for their own account (a user), or are they accepting value from one person and transmitting it to another?

02 2014: mining for your own account

FIN-2014-R001 (30 January 2014) answered the solo-mining question. FinCEN wrote that "what is material to the conclusion that a person is not an MSB is not the mechanism by which a person obtains the convertible virtual currency, but what the person uses the convertible virtual currency for, and for whose benefit." It then said:

The ruling also carries a warning that is easy to skip: "any transfers to third parties at the behest of sellers, creditors, owners, or counterparties involved in these transactions should be closely scrutinized, as they may constitute money transmission." Mining for yourself is not transmission. Moving coins around on someone else's instruction might be.

This is the ruling that covers an operator's own solo mining — for Spearmint, the 8% pre-launch acquisition mined at the ordinary block reward. It says nothing about paying other people's mining rewards to them. That is the 2019 guidance.

03 2019: section 5.4 on mining pools

FIN-2019-G001 (9 May 2019), "Application of FinCEN's Regulations to Certain Business Models Involving Convertible Virtual Currencies", is a consolidation of FinCEN's positions with worked business models. Section 5.4, at page 28, is titled "CVC Money Transmission Performed by Mining Pools and Cloud Miners". It first describes the fact pattern:

That is the ordinary centralised pool: the coinbase pays the pool's address, the pool apportions, the pool pays members. FinCEN's conclusion on that model is the sentence every pool operator should have on the wall:

Three things about that sentence deserve attention. First, the exemption attaches to the distribution of the amount earned — the reward the pool itself mined. It does not describe a pool receiving value from members. Second, the reasoning is the integral-services exemption, discussed below, not a mining-specific carve-out. Third, it is guidance, not a rule: it explains how FinCEN reads its existing regulations against a described fact pattern. Change the facts and the reading can change.

04 The hosted-wallet line

The paragraph does not end there. The next sentence is the one that turns a pool into a money transmitter:

"Hosting CVC wallets" is defined earlier in the same document. Section 4.2 (page 15) says: "Wallets where user funds are controlled by third parties are called 'hosted wallets' whereas wallets where users control the funds are called 'unhosted wallets.'" It then gives the four criteria FinCEN applies to any intermediary between an owner and their value:

• (a) who owns the value;
• (b) where the value is stored;
• (c) whether the owner interacts directly with the payment system where the CVC runs; and
• (d) whether the person acting as intermediary has total independent control over the value.

Section 4.2.1 adds a sentence that applies regardless of what a business calls itself: if "the value is represented as an entry in the accounts of the provider, the owner does not interact with the payment system directly, or the provider maintains total independent control of the value, the provider will also qualify as a money transmitter, regardless of the label the person applies to itself or its activities."

Read the two halves of §5.4 together and the shape is clear. A pool that mines, apportions and pays out is on the integral side. A pool that mines, apportions, and then keeps members' rewards in accounts it controls — letting members accumulate, hold, move or redirect value there — has added a hosted-wallet service to a mining service, and FinCEN says the combination is account-based money transmission.

05 The integral exemption, strictly construed

The exemption FinCEN relies on is at 31 CFR 1010.100(ff)(5)(ii)(F): the money transmitter definition does not include a person that "accepts and transmits funds only integral to the sale of goods or the provision of services, other than money transmission services, by the person who is accepting and transmitting the funds."

The 2019 guidance describes how FinCEN applies it. Two conditions: the person's business must be different from money transmission itself, and the money transmission activity must be necessary for the business to operate. And a caution at page 8: "FinCEN interprets these exemptions strictly. Therefore, a person may not take advantage of a particular exemption if the activity it engages in does not conform fully to an exemption."

For a pool, "conform fully" is a design brief. The business is mining. Paying members their share of a mined reward is necessary to that business — a pool that could not pay would have no members. A pool that also lets members deposit coins, hold balances indefinitely, transfer between accounts, or convert to another asset is doing things that are not necessary to mining. Each of those is an activity that does not conform to the exemption, and the guidance says the exemption is then unavailable for it.

06 Design choices that move the line

None of this is decided by a terms-of-service page. It is decided by what the software does. The following features are common in pool software and each pushes the fact pattern in a direction. This is the analysis Spearmint Mining used for its own compliance-by-design matrix.

The pattern: features that make the pool hold or move value for members are the ones that move it toward money transmission; features that make the pool pay out and forget keep it inside §5.4. Spearmint Mining's answer was to omit the first group entirely — no accounts, no address changes, no deposits, no transfers, PPLNS only, automatic daily payouts — and to publish the list of features that cannot be added later without a new legal review.

07 Why this does not settle state law

FinCEN guidance interprets a federal statute. The 49 states with money-transmitter licensing laws each have their own definitions of "money", "money transmission" and "virtual currency", their own exemptions, and their own examiners. Several have adopted virtual-currency provisions since 2019, and their exemptions do not necessarily mirror FinCEN's. A pool can be squarely within §5.4 federally and still face a state licensing question.

Pennsylvania is the example that matters for Spearmint Mining, whose operator is a Pennsylvania company. The Commonwealth's Money Transmission and Virtual Currency Transmission Business Licensing Law (Act 7 of 2025, in force since 26 August 2025) requires a licence to transmit virtual currency for a fee "with or on behalf of an individual" and contains no mining or integral-services exemption. That statute is the subject of a separate article, and it is the first item on Spearmint Mining's attorney review list.

08 Key takeaways

• FinCEN's FIN-2019-G001 §5.4 says a pool leader's distribution of mined rewards to members "does not qualify as money transmission under the BSA" because it is integral to the mining service.
• The same section says a pool that also hosts CVC wallets for members "will fall under FinCEN's definition of money transmitter for engaging in account-based money transmission".
• "Hosted" is defined by control: who owns the value, where it is stored, whether the owner touches the chain directly, and whether the intermediary has total independent control.
• FinCEN interprets the integral exemption strictly — activity that is not necessary to mining does not get the exemption's benefit.
• Deposits, member-to-member transfers, held balances, account-based address changes and auto-conversion all move a pool away from §5.4; automatic payouts to member-supplied addresses keep it inside.
• Federal guidance does not resolve state licensing. Pennsylvania's Act 7 of 2025 has no mining exemption at all.

09 Questions people ask

10 Sources

1. FinCEN, FIN-2019-G001, "Application of FinCEN's Regulations to Certain Business Models Involving Convertible Virtual Currencies", 9 May 2019 — §2.2 (p. 8), §4.2–4.2.1 (pp. 15–16), §5.4 (p. 28). fincen.gov (PDF)
2. FinCEN, FIN-2014-R001, "Application of FinCEN's Regulations to Virtual Currency Mining Operations", 30 January 2014. fincen.gov
3. FinCEN, FIN-2013-G001, "Application of FinCEN's Regulations to Persons Administering, Exchanging, or Using Virtual Currencies", 18 March 2013. fincen.gov
4. 31 CFR § 1010.100(ff)(5) — definition of money transmitter and exemptions. ecfr.gov
5. Pennsylvania Act 7 of 2025 (SB 202), Money Transmission and Virtual Currency Transmission Business Licensing Law. palegis.us