Wei Dai
Computer engineer who proposed b-money
Described b-money, an early proposal for anonymous distributed electronic cash that is cited in the Bitcoin white paper.
Biography
Wei Dai is a computer engineer and cryptographer who published b-money in 1998, a proposal for money that could be created and transferred without any institution issuing it. He is the first reference in the Bitcoin white paper, which cites b-money in its opening line about the problem of electronic cash. Very little about his life is publicly documented, and he has given almost no interviews, so the record is essentially the work rather than the person.
The b-money proposal was posted to the cypherpunks mailing list, the same forum where much of the era's work on cryptography and digital money circulated. It described a system in which participants keep their own record of how much money everyone holds, new money is created by performing computational work whose cost is known, and contracts between participants are enforced by the group rather than by a court. Each of those elements appears in Bitcoin in some altered form.
He also wrote Crypto++, a free library of cryptographic algorithms first released in the 1990s that is still used in software today. It is a separate contribution from b-money and a more widely used one in practice, though it is the essay that gets cited. He has written on other subjects since, mostly in online essays on decision theory and the long-run consequences of technology.
Career timeline
- 1995Releases early versions of Crypto++, a free cryptographic algorithms library.
- 1998Publishes the b-money proposal to the cypherpunks mailing list.
- 2008Corresponds with Satoshi Nakamoto shortly before the Bitcoin white paper is published.
- 2009b-money appears as the first citation in the Bitcoin white paper.
Why he proposed money without an issuer
The stated motivation for b-money was political rather than commercial. He described being interested in a community whose rules are enforced by the design of the system rather than by anyone with the power to compel participants, and money was the piece that such a community would need and did not have. The proposal follows from that: if participation cannot be compelled, then issuing money cannot depend on an institution either.
The mechanism he reached for was cost. New money in b-money is created by performing computation whose expense is measurable, which ties the supply to something real without anyone deciding how much to make. Bitcoin uses the same instinct in a different construction, and the difference between the two is instructive: b-money assumed participants would each keep the ledger and stay honest through deposits and penalties, while Bitcoin made the ledger public and settled disagreements by which chain had the most work behind it.
Key ideas
Tap any idea to expand a plain-English explanation, why it matters, and where to learn more.
b-money
A 1998 proposal for a currency created and transferred by its participants, with no institution issuing it.
It is the first citation in the Bitcoin white paper and set out the problem Bitcoin later solved differently.
Participants each maintain a record of holdings, and new money is created through measurable computational work.
Creation through cost
Tying the creation of new money to computation whose expense can be measured, rather than to a decision.
It removes the need for anyone to be trusted with the supply, which is the dependency the proposal set out to avoid.
Bitcoin uses the same principle, with the cost paid by miners producing blocks.
Enforcement by design
Rules that hold because of how a system is built rather than because an authority can compel participants.
It is the reasoning that leads from wanting a voluntary community to needing money without an issuer.
b-money proposed deposits and penalties among participants in place of an outside enforcer.
Crypto++
A free library of cryptographic algorithms he first released in the 1990s and maintained for years.
It is his most widely used contribution in practice, even though the b-money essay is the more cited one.
The library is still incorporated into software that needs standard cryptographic primitives.
Major contributions
- Published b-money in 1998, the proposal cited first in the Bitcoin white paper.
- Described money creation through measurable computational cost rather than institutional decision.
- Wrote and maintained Crypto++, a free cryptographic library still used in software today.
- Corresponded with Satoshi Nakamoto in 2008 before the Bitcoin white paper was published.
Influence on investors
b-money is where a reader tracing Bitcoin's ancestry usually starts, because the white paper puts it first. The proposal did not produce a working system, and its importance is that it stated the goal precisely enough for someone else to build against a decade later.
Criticisms and debates
A balanced view includes the main criticisms and open debates, presented neutrally.
- b-money was never implemented. It described how such a system might work without resolving how participants who had never met would agree on a single record, which is the specific problem Bitcoin solved.
- The enforcement model depended on participants holding deposits and penalising each other, an arrangement critics regard as unworkable at scale without the mechanism Bitcoin later supplied.
- He has said little publicly about Bitcoin, so his own assessment of what the proposal contributed is largely absent from the record.
Lessons for investors
Plain-English takeaways. Context for learning, not advice to buy or sell anything.
- 1State a goal precisely enough that someone else can build against it later.
- 2Notice when a proposal names a problem without solving it, because that gap is usually where the real difficulty sits.
- 3Treat the cost of producing something as a way to constrain supply without trusting anyone to decide it.
- 4Read an original source rather than the summary of it, since a citation often carries more nuance than its reputation.
Notable quotes
“I am fascinated by the idea of a community where violence is impossible because participants cannot be linked to their true names.”
Context: Wei Dai describing the motivation behind b-money, an early proposal cited in the bitcoin whitepaper.
Frequently asked questions
Who is Wei Dai?
A computer engineer and cryptographer who published the b-money proposal in 1998 and wrote the Crypto++ cryptographic library. Little about his personal life is publicly documented.
What is b-money?
A 1998 proposal for a currency with no central issuer, in which participants keep their own record of holdings and new money is created through measurable computational work. It is the first citation in the Bitcoin white paper.
Is Wei Dai Satoshi Nakamoto?
He has said he is not, and no claim about the identity of Satoshi Nakamoto has ever been established. He is named in that speculation because b-money is the white paper's first reference.
Was b-money ever built?
No. It remained a written proposal. It did not resolve how participants would agree on one shared record, which is the problem Bitcoin addressed with its chain of blocks.
Related quotes
Other people in the library writing on the same themes.
Philosophies Wei Dai is associated with
Schools of thought whose practitioner list names them. Association is not endorsement of the approach.
Related guides
Related concepts
Related people
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