字幕列表 影片播放 列印英文字幕 The following content is provided under a Creative Commons license. Your support will help MIT OpenCourseWare continue to offer high quality educational resources for free. To make a donation, or to view additional materials from hundreds of MIT courses, visit MIT OpenCourseWare at ocw.mit.edu. GARY GENSLER: Today we're coming back to blockchain and money, Act Three of this course. Now that we've done a little of the basics, a little bit of the economics, and now it's some use cases through the lens of finance. And to say something about one, why I thought it'd be worthwhile to structure the course this way, and what I'm hoping we all get out of these next 10 or 11 lectures is that I thought that it was important after laying some foundation of what blockchain technology might or might not be, and cryptocurrencies, and of course, talking about the economics, is to use one field that's the most dominant field right now about potential blockchain technology use, which is finance. It's not the only area, but finance is completely reliant on ledgers. It's completely reliant on moving property rights around multiple parties. And of course, the first use case was about Bitcoin, which was a peer-to-peer money. So I thought even if you're thinking about this in terms of health care, thinking about it terms of the internet of things, et cetera, many, many other use cases, why not take finance. Now it also happens to be my comparative background. And I've spent the last three or four decades of my life around finance. And so I can be most helpful and dig deep, you know, probably as deep as you want to get in the mortgage market, the payment markets, the exchange markets. I've probably been there at some point in my career, or still have contacts and networks and have studied it. But no doubt, with the 80 of you in this room, or 90 or so, you're going to press me. And that I like that. I will say last weekend was really a joy reading 50-plus papers that it was only about 25 of you that had decided to hand in papers early in classes 2 through 9. But class 10 was 50-plus of you. So I really do have a sense of the class in terms of what you think about finance and blockchain. Of course, you'll probably do the same. I think I might design it differently the next time. But if you all hand in-- if 50 or 60 of you hand in the papers for class 23, it will be-- and you have that right. I'm not taking that away from any of you. But it means I might be delayed getting back all the projects. I want to say two or three other things overall. In terms of where we are, we're halfway through the semester. And Sabrina and Thalita and I did a good job of just saying, how are we doing on class participation? And I've kidded a lot, and I've joked a lot about who's talked and so forth. We're down to about 15 of you that have never talked in this whole 12-- so I want to work with you. I'm not trying to torture anybody. And I really want you to all not to worry too much about your grades. I want you to worry a little bit, but not too much about your grades. But if you've not spoken yet, and you haven't gone online-- two people have gone online, both of whom I've responded to. You know, come see me. Try to figure out how to be part of this community and this discussion, whether it's in class or online in some way. Cause again, I want this to be a positive learning experience for everybody. In terms of the papers and just some overall things, by and large they were good. Some were extraordinarily good, which you'd expect with such a talented group of people. But some really made me think and challenged me and so forth. It is a bell-shaped curve. Some, on the other hand-- not many-- kind of missed the mark. So I just want to say a couple of things. One is, it's not about just answering the three study questions. The study questions are really to spur the dialogue here. There's three questions. Not many of you, but two or three people just sort of just tried to answer those. Think about it as a uniform three-page paper. Five is the limit. One or two of you that did six or seven pages. That's fine, but it's just-- you don't need to, and it's more work, in a sense, for us. Two is, I really did try to give feedback and comments. And overall what we're trying to get to is, what are the economics here? What is there about append-only logs and consensus protocols amongst multiple parties writing to a shared ledger? So multiple parties updating some state of economic-- an economic state, really-- of property rights or something. And what verification costs, what networking costs, could be lowered. And it's unfair, because all of you are going to try to figure out a final project together. And I went back over the weekend looking at the final projects. I think there's some really neat ideas that you're looking at. But at the core is what verification costs, what networking costs, can you lower. Why do append-only logs consensus amongst multiple parties sharing a ledger, and possibly a native token. Because you don't have to do something around permissionless native tokens. But I think some of you will get there. And we'll have some exciting thoughts. So those were my thoughts. If I say in the comments to your paper-- and I only did this two or three times-- come see me, don't be scared. It might just be I want to pursue. I said this on some really excellent papers, and I said this on one or two that just I thought it'd be worthwhile to talk about. But I'm trying to just get through this all with you and have you learn. So there's just some overall thoughts on where we are halfway through. Post SIP week. Today we're going to talk about payments. And Thursday we have a guest, Alin. If you want to get mic'd up, I've got a mic up here somewhere for you, cause I'm going to call on you. Or you can speak from there. ALIN DRAGOS: I'll be loud. I'll be very loud. GARY GENSLER: Yeah. That's not hard, is it? So what are we going to do? We're going to talk about just what are we trying to cover for the rest of this semester? Sort of call it H2 in blockchain and money. The readings, payment systems, ledgers, and credit cards. Just a little bit of history all together. And that's when you're going to meet Alin. Not computer science Alin, but payment Alin. And we're going to talk about mobile payments, which is a very significant change all the way around the globe in payments. Then global and US payments statistics. Bitcoin and blockchain we're going to come back to. And then conclusion. And remember, whether it's this week, next week, or the following week, this is all just to sort of say, well, wait. What are these use cases tell us about blockchain? What are these use cases tell us about cryptocurrencies? My goal isn't that everybody here is an expert in payment.