What Satoshi Actually Solved: How Hashcash, B-money, and Bitgold Laid the Foundation for Bitcoin

Added: 2026-05-16

[00:00:00]Electronic cash for the internet is very interesting and exciting technology and [music] people were excited about it already back then, but it needed to be decentralized. And so, people were brainstorming how to build a more decentralized system, but I put forward the hash cash idea, >> [music] >> which is really the idea of using proof of work to create a postage stamp for internet services like [music] email to make spam more costly. It's used in a number of different settings and it immediately became one of the kind of building blocks in this ongoing [music] discussion about how to build a decentralized electronic cash, because how do you distribute the [music] coins, how do you bring them into existence?

[00:00:34]And so, mining became part of that. So, all of the main precursors [music] to Bitcoin that came after it like e-money by Wei Dai, b-money by Nick Szabo, and RPOW by [music] Hal Finney were using hash cash as their building block for how to create coins, how to mine coins, but there was still some gaps in how [music] to actually make it properly decentralized, which is really about the economics of it. So, I think what Satoshi solved [music] is the difficulty adjustment, the dynamic difficulty in the mining so that it reacts [music] to the market. So, effectively letting the market set the price, but fixing the rate of supply and the total supply, the now famous 21 million limit. Those were Satoshi's additions to those previous ideas.