BTC022: BITCOIN’S PROOF OF WORK

W/ DR. ADAM BACK

21 April 2021

On today’s episode, Preston talks with Dr. Adam Back. Adam is a core developer, inventor of Proof of Work, and CEO/ Founder of Blockstream. This episode covers Adam’s early developments, and where he’s taking Blockstream in the future.

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IN THIS EPISODE, YOU’LL LEARN:

  • How did Dr. Back discover Proof of Work (PoW)?
  • Is Proof of Work a vital component of Bitcoin’s price floor?
  • Blockstream’s new initiative into mining.
  • Blockstream’s new issuance of a debt note that pays Bitcoin coupons.
  • Using digital tokens on liquid for registry purposes for the note.
  • How mining can reduce volatility while still capturing significant upside.
  • Dr. Back’s thoughts on the Bitcoin contango trade.

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TRANSCRIPT

Disclaimer: The transcript that follows has been generated using artificial intelligence. We strive to be as accurate as possible, but minor errors and slightly off timestamps may be present due to platform differences.

Preston Pysh (00:00:02):
Hey everyone. Welcome to this Wednesday’s release of the show where we’re talking about Bitcoin. Today’s guest is probably the biggest name in the entire Bitcoin space, and that’s Dr. Adam Back. Dr. Back is the inventor of Proof of Work, which is one of the key components of the Bitcoin codebase. In fact, Satoshi Nakamoto’s original Bitcoin white paper referenced Dr. Back for his key contributions to make the blockchain even possible. Beyond his initial contributions, Dr. Back is the co-founder and CEO of Blockstream, which is a company that’s a leader in innovation and foresight for the entire Bitcoin ecosystem. During this discussion, Dr. Back talks about some of his early discoveries, his opinion on Proof of Work and why it’s important, some of the new initiatives at Blockstream to bring more mining capacity to North America, his opinion on the Bitcoin contango trade, and much, much more. Without further delay, here’s my chat with the one and only Dr. Adam Back.

Intro (00:01:01):
You are listening to Bitcoin fundamentals by The Investor’s Podcast Network. Now, for your host Preston Pysh.

Preston Pysh (00:01:20):
Hey everyone. Welcome to the show. Here I am with the one and only Adam Back. Adam, welcome to the show.

Adam Back (00:01:25):
Thanks for having me on.

Preston Pysh (00:01:27):
Adam, I think the question I’ve been dying to ask you is just your discovery of proof of work for me is mind-blowing, and it’s mind-blowing that this was incorporated straight into the white paper. Satoshi referenced you in the white paper. I just try to put myself in your shoes, and going back to the moment where you discovered this, and what led up to it when you discovered it, and you started to write about it, what kind of utility did you think that it had at that time or at that moment? Just explain that moment to us as you discovered this.

Adam Back (00:02:06):I was running an anonymous, so I got interested in cryptography and privacy and basically deploying technology allowed users to exercise their rights on the online world. I was running this remodeler and at that time, this is the late ’90s, obviously still today there was a recurring problem with spam, and when people would send all unsolicited mail, probably with a one in million conversion rate, but hey, sending an email was practically free, and it’s a bane. Most people and anybody operating a mail server individually or as a company, the majority of the email that they were processing was spam, and it was also a nuisance for users to, because they have to sift through all this stuff to find the actual emails. That was going on in the background, but my particular concern was operating this Remover to get privacy, and it also had the ability to post, to use net discussion groups protocols, decentralized meaningless like technology chat forums.

Adam Back (00:03:09):
It seemed that there were people that were sending spam through the Removers, particularly to these discussion groups. Once they hit these discussion groups, the Usenet technology broad that across thousands of servers all over the world. It’s actually a way to amplify a denial of service. It wasn’t even a commercial span. It just looked like random numbers and things. Talking amongst people who operate Removers on a safe points list, our best theory was that people that were doing this were pro-establishment, anti-privacy, and just wanted to annoy the administrators of using that service so that they would try to block Removers. It seemed like an anti-privacy, create some nuisance so that there would be blowback against Removers because people were spamming with it. Anyway, it was a problem for Removers, what do we do about this?

Adam Back (00:04:02):
Usually what people do about spam is they put their system administrator hone, and they think, I’m the super user, which is more the case in those days. Big servers and not that many powerful desktops and laptops, and they would block IP addresses, block email addresses, but the actual protocol and the permissionless incident is there isn’t really any concept of super user and regular user. Once you get onto the IP network, everybody is the same. It struck me, this was a bad and dangerous direction because it was pushing towards the incident driver’s license concepts, which resurfaces once in awhile. People want real names or personal information in order to get a cell phone contract or an internet connection. The whole point of Removers was that you should have privacy in communicating person to person, and particularly in discussion forums. I had to look at the spam problem from a different direction, which is, the blocking identities and IP addresses isn’t really a solution, it’s losing arms race, and anyway, it’s trending in a bad direction. What’s the root problem? The root problem is email is practically free.

Adam Back (00:05:17):
I was thinking people on the soft points place were already pretty excited and interested in electronic cash, but it was difficulties bootstrapping it because it relied on banking ponder and that kind of thing. Some of the electronic protocols then were centralized. There’ll be a central server with a double spending. Not like David Trump’s protocol and some other ones, a similar design. Actually, PayPal didn’t exist, getting a credit card, merchant processing account was difficult, complicated, and anyway, not a fit for sending private mails because of density, and it would also exclude lots of people. Billions of people in the world don’t have credit cards, and couldn’t get a credit card merchant processing account. Don’t want to put their ID on things. Somebody’s financial wellbeing where they’re happy to send $0.10 or $1 to send a message, maybe that’s expensive to somebody, and we want to have a global even discussion on Usenet about wide range of topics.

Adam Back (00:06:18):
That’s where we can’t use the banking rails, we can’t pay them, so it’s complicated, but could we at least add a cost to the sender? I had coincidentally been looking at hash collisions, so there’s this concept called the birthday paradox, where if you pick a room of people and you say, what is the chance that some people share the same birthday, it’s a much lower number than you expect, just to a statistical anomaly or counterintuitive facts.

Adam Back (00:06:47):
With the hash functions, such as [inaudible 00:06:49], a similar thing applies, except the cost. Now you’d have to try lots of hashes until you find two that collide to the same output. The work to do that is impractical. You can run all the computers in the world until Sunbelt’s out and probably wouldn’t find one or something. If you did have one, if somebody from the far future came back and gave you one, you could instantly verify it, a few thousand CPU cycles. I thought that was a fascinating concept, which relates. Which is, you can prove that work was expended, but this is far too expensive, so maybe we can tune it and modify the design of what’s going on so that you can make it tuneabley expensive and still instantly verifiable. That’s where Hash Cash came from.

Adam Back (00:07:33):
Because it was for store and forward, like a communication mechanism where there’s not a client and a server interacting, where the service says, “Please answer this challenge,” and then you solve a capture and you send it back. A capture thing, another thing it’s used for this, but there’s no client and server, it’s broadcast, and the reader is not online at the same time as the sender, kind of thing. It was necessary for the sender to make a proof, using a challenge that he chose himself, that made it a genuine proof rather than something that commences on your server, it’s a transferrable proof. Anybody can verify that. The person that posted this discussion comment, spent a cent of electrical power doing so or something.

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