Voices of Texas Bitcoin · No. 1

Doctor Bitcoin: Mark Hopkins and the Federal Line Texas Never Drew

Texas told its bitcoiners they needed no license to sell. Federal law read the same trade differently. The first profile in our people-of-the-scene series is the man who found the seam — and now spends his time warning everyone else where it runs.

By TexasBitcoin · Published July 22, 2026 · Updated July 22, 2026

The short answer

“Doctor Bitcoin” is Mark Alexander Hopkins, a Richardson, Texas bitcoiner who pleaded guilty on June 29, 2021 to operating an unlicensed money transmitting business after converting cash to bitcoin peer-to-peer. Texas itself requires no license to sell bitcoin — but federal law required his business to register with FinCEN. Hopkins served federal time, and now warns other peer-to-peer traders about exactly that gap.

Key facts

On June 29, 2021, Mark Alexander Hopkins, 42, of Richardson, Texas — alias “Doctor Bitcoin” — pleaded guilty in the Northern District of Texas to one count of operating an unlicensed money transmitting business.^[1]^[5]
According to the DOJ, Hopkins converted between $550,000 and $1.5 million across 37 transactions over roughly a year for one customer whose cash came from a Nigerian lottery scam.^[1]^[4]
The charge carried up to five years in federal prison; Cointelegraph reported in September 2022 that Hopkins was to serve between six and 15 months, reporting to FCI Beaumont in Texas.^[1]^[6]
Texas Supervisory Memorandum 1037 (April 3, 2014) holds that Bitcoin is not “money” under the Texas Money Services Act, so selling your own bitcoin requires no state money-transmission license.^[2]
FinCEN guidance FIN-2019-G001 (May 9, 2019) applies federal money-services-business rules — registration, anti-money-laundering programs, recordkeeping — to virtual-currency money transmitters, including peer-to-peer exchangers operating as a business.^[3]

The history of Bitcoin in Texas is usually told in megawatts and memoranda. But the scene was built by people — organizers, miners, educators, evangelists — and some of them paid tuition for lessons the rest of the state got free. Voices of Texas Bitcoin profiles those people. We start with the hardest story first, because it carries the most transferable knowledge: the case that taught Texas P2P traders that a friendly state is only half the map.

Who is Doctor Bitcoin?

Doctor Bitcoin is the alias of Mark Alexander Hopkins, a Richardson, Texas bitcoiner who became one of the Dallas area's early Bitcoin educators and peer-to-peer sellers.^[5]^[7] His origin story is the kind the early network ran on: Hopkins told Bitcoin Magazine he got his first coin in 2011, when a friend paid for a coffeehouse meal with half a bitcoin freshly mined on a laptop — worth, by his recollection, about thirteen or fourteen dollars.^[7]

From there he sold bitcoin peer-to-peer for years — cash deals and bank wires — and by his own account the point was as much evangelism as income. He told Bitcoin Magazine he sold “mostly to meet people,” rarely profiting except on larger deals, treating the trades as a way to bring newcomers into the network and clients into his marketing business.^[7] He also said he sought counsel from Texas lawmakers, who pointed him to the state's published position that selling bitcoin required no Texas license.^[7] On the state map he was reading, he was in the clear. The federal map — the one that ultimately mattered — is drawn by a different cartographer.

What was Mark Hopkins charged with?

Hopkins was charged with a registration offense, not fraud. On June 29, 2021, he pleaded guilty in the Northern District of Texas to one count of operating an unlicensed money transmitting business — a violation of 18 U.S.C. § 1960, in case number 3:21-cr-00144.^[1]^[4]^[5] According to the Department of Justice, Hopkins ran a business converting U.S. dollars to cryptocurrency, primarily bitcoin, for a fee — without registering with FinCEN as a money services business and without anti-money-laundering or know-your-customer procedures.^[1]^[4]

The case turned on one customer. Beginning in September 2019, a customer identified in court papers as “M.H.” brought Hopkins cash that, per the DOJ, stemmed from a lottery scam run with a co-conspirator in Nigeria; over roughly a year Hopkins converted between $550,000 and $1.5 million for her across 37 transactions.^[1]^[4] Per the plea papers, Hopkins told M.H. “I don't want to get into details of whatever business [customers] are involved in,” and instructed her to keep deposits under $9,500 to avoid bank reporting.^[4]Acting U.S. Attorney Prerak Shah put the government's theory plainly: “This defendant ignored federal law and allowed fraudsters to use Bitcoin to operate under the radar of law enforcement.”^[5] Hopkins, for his part, told Bitcoin Magazine that federal agents had raided his home on October 23, and that he took the plea because “my family comes first.”^[7]

Was selling Bitcoin peer-to-peer illegal in Texas?

Not under Texas law — and that is the whole story. Supervisory Memorandum 1037, issued by the Texas Department of Banking on April 3, 2014, holds that Bitcoin is not “money” under the Texas Money Services Act, so selling your own bitcoin does not by itself require a state money-transmission license.^[2] That clarity is real, it predates almost every other state's position, and it is a genuine reason Texas became the friendliest jurisdiction in the country for Bitcoin.

Federal law runs on a separate track. 18 U.S.C. § 1960 — a statute from 1992, decades older than Bitcoin — makes it a federal crime to operate an unlicensed or unregistered money transmitting business.^[6] And FinCEN's guidance FIN-2019-G001, issued May 9, 2019, applies the federal money-services-business framework to virtual currency explicitly — including peer-to-peer exchangers, natural persons trading as a business, who must register with FinCEN and run anti-money-laundering programs like any other money transmitter.^[3] The two maps simply do not overlap: Texas asks nothing of a P2P seller that federal law does not, and federal law asks everything Texas does not. Hopkins's case is the place where a Texas bitcoiner stood on the state map and was prosecuted off the federal one.

What sentence did Doctor Bitcoin receive?

The charge carried a maximum of five years in federal prison.^[1] Cointelegraph reported in September 2022 that Hopkins was to serve between six and 15 months, and he reported to the federal correctional institution in Beaumont, Texas that month.^[6] His son kept his social accounts running while he was inside, and he came out doing the same thing he went in doing: educating — just with a sharper syllabus.^[7]

The record, read straight

An honest profile holds both readings at once. The government's account is not flattering: per the DOJ, Hopkins declined to look into his customers' businesses, kept converting after the volume grew large, and coached a customer on staying under bank reporting thresholds.^[1]^[4] Hopkins's account is not a denial of the plea but a protest of the frame: he has said he was “fully registered as a Bitcoin seller with FinCEN” and that he was “originally suspected of being a kingpin in this particular scam” — a suspicion the eventual single registration count did not reflect.^[6] The plea resolved the legal question. The cultural argument — whether a registration statute from 1992 should reach a hobbyist-scale P2P seller — is the one he took public. We present the record and let it carry its own weight; that is the deal this series makes with every subject.

What did the Hopkins case change?

It gave Texas P2P traders their clearest cautionary tale — narrated by the defendant himself. “I'm just a regular bitcoiner caught in the crosshairs,” Hopkins told Bitcoin Magazine, and he has spent his post-release energy warning that, as currently interpreted, § 1960 means “any time anyone with a crypto trades p2p (i.e., not with an exchange), they're legally liable under this statute.”^[6]^[7] He calls the statute an “existential threat” to peer-to-peer trading and urges bitcoiners to push their legislators to change it.^[7]

The practical lesson is transferable and worth stating flatly: a state's clarity is not the whole map. Supervisory Memorandum 1037 defines what Texas asks of you — it has never defined what Washington does. Anyone regularly exchanging cash for bitcoin as a business is a money services business in FinCEN's eyes and must register federally, whatever their state says.^[3] That is not a reason to fear the frontier; it is the frontier's actual terrain. The Texas scene absorbed the lesson, kept building — and the sharpest advocate for fixing the federal seam is the man who fell into it.

Hear him tell it

This profile is built from the public record — but Hopkins has told the story himself, at length, on the record. We've mapped every substantial interview he has given about the case — the 51-minute Digital Cash Network sit-down, the Free Talk Live appearance, and the federal-prison conversation with Aria DiMezzo — blended into one story in The Doctor Bitcoin Tapes.

About this series: Voices of Texas Bitcoin

Voices of Texas Bitcoin profiles the people who built the Texas scene — the organizers, builders, educators, and pioneers behind the headlines. Next up: the meetup organizers we'll profile next, the volunteers running Bitcoin nights from El Paso to Houston. For the full arc these people move through, start with the history of Bitcoin in Texas — from the 2014 Supervisory Memo to the 2025 Strategic Bitcoin Reserve — and see where the industrial side of the story lives on the Texas Bitcoin mining map.

Frequently asked questions

Who is Doctor Bitcoin?

Doctor Bitcoin is the alias of Mark Alexander Hopkins, a Richardson, Texas bitcoiner and early Dallas-area Bitcoin educator who sold bitcoin peer-to-peer for cash. He pleaded guilty in June 2021 to operating an unlicensed money transmitting business, served federal time, and became a public voice warning P2P traders about federal registration law.

Why was Doctor Bitcoin prosecuted?

For a registration offense, not fraud. According to the Department of Justice, Hopkins converted cash to bitcoin for a fee without registering his business with FinCEN, and one customer's cash — between $550,000 and $1.5 million across 37 transactions — came from a Nigerian lottery scam. He pleaded guilty to one count of operating an unlicensed money transmitting business.

Is it legal to sell Bitcoin peer-to-peer in Texas?

Under Texas law, selling your own bitcoin requires no state money-transmission license — Supervisory Memorandum 1037 (2014) holds that Bitcoin is not 'money' under the Texas Money Services Act. Federal law is separate: FinCEN's 2019 guidance treats peer-to-peer exchangers operating as a business as money transmitters that must register with FinCEN. That gap is what the Hopkins case made concrete.

What sentence did Doctor Bitcoin receive?

The charge carried up to five years in federal prison. Cointelegraph reported in September 2022 that Hopkins was to serve between six and 15 months, and he reported to the federal correctional institution in Beaumont, Texas that month.

What is 18 U.S.C. § 1960?

A 1992 federal statute that makes operating an unlicensed or unregistered money transmitting business a crime. Under FinCEN's 2019 guidance, peer-to-peer virtual-currency exchangers operating as a business count as money transmitters — so trading without FinCEN registration can violate § 1960 even in a state, like Texas, that requires no license of its own.

Sources

Every datable claim above is sourced below. Characterizations of the case follow the Department of Justice's public statements; Hopkins's own account is attributed to his public interviews. This is a research and reference article, not financial or legal advice.