The same year Wei Dai proposed b-money, another cryptographer was working on an even more elaborate vision. His name was Nick Szabo, and the system he designed was called Bit Gold. Szabo had been thinking about the nature of money for years. As a polymath trained in law, computer science, and economics, he understood what previous digital cash pioneers had missed: money is not just technology — it’s a social and economic institution with deep roots in human history.
Szabo’s insight was to look at what made gold valuable for thousands of years. Gold was scarce. It was hard to create — you had to find it, mine it, refine it. It was verifiable — you could test its purity. It was durable. And crucially, no single entity controlled its production. What Szabo wanted to design was a digital asset with all these properties: scarce, hard to produce, verifiable, durable, and decentralized.
Bit Gold worked through chained proof-of-work puzzles. Participants would solve a computational challenge, and the solution would become the input for the next challenge. This created a chronological chain of work that anyone could verify. Each solution was a kind of digital “nugget” — you had proof you had done the work to create it, and everyone could verify that proof.
Sound familiar? That’s because Bit Gold was essentially a blueprint for what Satoshi Nakamoto would later implement as the Bitcoin blockchain. The chain of proof-of-work. The scarcity via difficulty. The decentralized verification. Every key idea was there, just a decade before Bitcoin was launched.
Like Wei Dai, Szabo never actually implemented Bit Gold. He couldn’t solve the final problem: how do you prevent the same gold nugget from being spent twice? The double-spend problem haunted all pre-Bitcoin digital cash proposals. It took Satoshi’s specific innovation — the proof-of-work-secured blockchain — to finally crack it. But Bit Gold’s intellectual fingerprints are all over Bitcoin. Many have speculated Szabo himself might be Satoshi, given the strong similarities. Szabo has always denied it. What’s certain is that Bit Gold was one of the two most important stepping stones to Bitcoin.
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