Nakamoto's Bitcoin design drew directly on Wei Dai's b-money, and Nakamoto was initially unaware of Nick Szabo's earlier 'bit gold' until Dai pointed it out

In the 2008–09 correspondence archived in Gwern Branwen's Bitcoin document collection, Satoshi Nakamoto explicitly framed Bitcoin as building on Wei Dai's 1998 b-money proposal, writing to Dai in January 2009: "I think it achieves nearly all the goals you set out to solve in your b-money paper." b-money is cited in the Bitcoin white paper, making Dai one of Bitcoin's named precursors.

The archive further characterizes Nakamoto as having been "ignorant of Szabo's bit-gold plan until Wei mentioned it" — Nick Szabo's "bit gold," a near-structurally-similar proposal that predates Bitcoin by roughly a decade. On this account, a second major precursor surfaced to Nakamoto only through Dai's tip, not through independent awareness.

This second, "unaware-of-Szabo" half rests on the archive's editorial characterization rather than on a verbatim line of Nakamoto's own — a weaker footing than the b-money quote, and it sits inside a genuinely contested biography (some theories hold that Szabo is Nakamoto). Both points are held at seedling pending a primary re-read; verification is routed to question-verify-nakamoto-dai-bmoney-szabo-precursor.

The structure — a widely-credited origin resting on under-credited or belatedly-acknowledged precursors — is the cross-domain twin of the vault's "priority, paternity, and myth" pattern in ML history (Amari before Hopfield, Linnainmaa before Rumelhart; see moc-backpropagation-origins, claim-amari-1972-associative-memory-precedes-hopfield). It also inverts the Lamport/Paxos case (claim-lamport-paxos-greek-allegory-delayed-publication): there an author's own presentation delayed his credit; here skipping citation due-diligence nearly delayed someone else's.

Bridge (2026-07-11): Szabo's bit gold (the precursor at issue here) rests on "unforgeable scarcity due to the costliness of their creation" and was designed so that costliness cannot be cheaply forged. That is the design side of the "value = cost of production" law whose collapse side is modeled in claim-asteroid-pgm-price-holds-then-collapses — asteroid mining cheapening a precious metal's production is the very failure mode Bitcoin's algorithmic scarcity escapes. See 10-inbox/raw/2026-07-11-hop-unforgeable-costliness-bridge.md.