The legality of bitcoin depends on who you are, and what you’re doing with it.
There are three main categories of bitcoin stakeholder. Someone may fall under more than one of these categories, and each category has its own legal considerations.
Users
These are individuals that obtain bitcoins, and either hoard them or spend them. Under the FinCEN guidance, users who simply exchange bitcoins for goods and services are using it legally.
FinCEN: “A person that creates units of this convertible virtual currency and uses it to purchase real or virtual goods and services is a user of the convertible virtual currency and not subject to regulation as a money transmitter.”
Miners
According to the FinCEN guidance, people creating bitcoins and exchanging them for fiat currency are not safe.
FinCEN: “By contrast, a person that creates units of convertible virtual currency and sells those units to another person for real currency or its equivalent is engaged in transmission to another location and is a money transmitter.”
Miners seem to fall into this category, which could theoretically make them liable for MTB classification. This is a bone of contention for bitcoin miners, who have asked for clarification. This issue has not to our knowledge been tested in court.
Exchanges
Exchanges are defined as MTBs.
FinCEN: “In addition, a person is an exchanger and a money transmitter if the person accepts such de-centralized convertible virtual currency from one person and transmits it to another person as part of the acceptance and transfer of currency, funds, or other value that substitutes for currency.”
