Jun 22, 2026 · 36 min · 10 segments
Adam Back invented Hashcash, the proof-of-work system Satoshi built Bitcoin. He was also the first person Satoshi ever contacted. The New York Times named him a Satoshi suspect. He says they're wrong…
Amanda CassattHost'Cause there was a popular centralized one that failed, and, you know, the Cypherpunks, uh, who were interested in, like, designing and implementing things to enable that, took the lesson that why did it fail? Well, it failed because it was centralized, so how could you make a decentralized electronic cash? So you can see immediately you have a problem because the system that failed was a stable coin type idea, and so you needed a bank account, and a peer-to-peer protocol, which is how you'd make it decentralized, can't have a bank account, so you're stuck, right? And so when I proposed Hashcash proof of work for kind of postage stamps for anti-spam, immediately became an idea that, well, wait a minute, you could use that to mine the coins, and then you don't need a bank account, and then people could trade them, and then there would be a value.
Well, I mean, it, it's, uh, it's actually sparked, um, a lot of kind of philosophical thoughts over the years, right? Where people talk about Bitcoin as a savings technology, increasing their time preference, so they think longer term because they have a, you know, a form of savings that can, you know, be very positive.


Um, but at the same time, you have always been committed to this being a technology that enables exit from the system.
Uh, we-- So we manufacture, uh, hardware wallets, we do software wallets, and so, you know, that's on the consumer side.
And we, uh, at Blockstream, we also do some protocol work and try to improve privacy in, in Bitcoin and Bitcoin layer two.
'Cause there was a popular centralized one that failed, and, you know, the Cypherpunks, uh, who were interested in, like, designing and implementing things to enable that, took the lesson that why did it fail? Well, it failed because it was centralized, so how could you make a decentralized electronic cash? So you can see immediately you have a problem because the system that failed was a stable coin type idea, and so you needed a bank account, and a peer-to-peer protocol, which is how you'd make it decentralized, can't have a bank account, so you're stuck, right? And so when I proposed Hashcash proof of work for kind of postage stamps for anti-spam, immediately became an idea that, well, wait a minute, you could use that to mine the coins, and then you don't need a bank account, and then people could trade them, and then there would be a value.
Well, I mean, it, it's, uh, it's actually sparked, um, a lot of kind of philosophical thoughts over the years, right? Where people talk about Bitcoin as a savings technology, increasing their time preference, so they think longer term because they have a, you know, a form of savings that can, you know, be very positive.


Um, but at the same time, you have always been committed to this being a technology that enables exit from the system.
Uh, we-- So we manufacture, uh, hardware wallets, we do software wallets, and so, you know, that's on the consumer side.
And we, uh, at Blockstream, we also do some protocol work and try to improve privacy in, in Bitcoin and Bitcoin layer two.
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