Hyperledger Foundation Meetups, 16 Apr 2019

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From YouTube: Hyperledger San Francisco Meetup - April16, 2019

Description

Video from the April 16 Hyperledger Meetup. This featured Swetha Repakula and Morgan Bauer from IBM speaking about 'Bringing the Ethereum Developer Experience to Hyperledger Fabric' and Ken Leung from Kiva speaking about 'Kiva Protocol: Expanding Financial Access with Hyperledger'.

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Hyperledger – Open Source Blockchain Technologies

Hyperledger is an open source community focused on developing a suite of stable frameworks, tools and libraries for enterprise-grade blockchain deployments.
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Okay, so fabric this fabric fabric is a mission.

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Platform is focuses more sort of enterprise appropriate, because all of the nodes in the network are graphic identifier, as they are in the network specifically to participate on behalf of some entity. Initially racial operations, and you necessarily trust each other. What they want to interact in a their gray fabric has much more granularity than most public blockchains. It turns out. You can set features such that only certain identities. Look, it uses the data or.

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The ability to obtain node is set to.

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And so the comparison to a public network is this finality of transaction. That means is in terms of once the block exists. That's on the chain, there's no way to get it off the chain. There's no forking to happen. You can't advance another chain and then all this former champions account. That's not a thing that happens in this there's consensus on what the block is going to be and then committed, and that's.

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How is all that done? That's policies which can be something like company, X and company Y, both after said yes, this thing this is a true transaction to lock.

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The same thing.

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And so example, and you set the stage here- we have.

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The network appears the ordering service here. We have two organizations, they both frontiers.

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That appears and then on each Peter. There is.

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And, lastly, is the order of service, and this is solely to determine what.

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Will be executed what or they will be given a.

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Transaction, what happens is here, Wyatt talks to the peers and it talks to as many years as is necessary to fulfill the enforcement Clause. So if we policy is, must have.

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At this point, this is management. The actual spark contract came to.

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Earth so what happens? Is the chain code will see the world state receivable ledger execute based on that data, and here we'll execute this transaction by the output and sign it with its.

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Flex all of these sources, then the client was sent to your reserves. Now as a service, that's what I mean it's. It could be multiple servers in its package, geez sighing transactions are sending to be ordering service were source, is collecting them constantly from multiple clients and packaging into block.

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At which point the ordering service makes the finalized laws and puts them in order and sends the block to the peers at this country. Here is to take the block and validated the block is acceptable and validate that the interior fits into your transactions are validated not so there can be invalid transactions in a block, and this occurs within the readwrite set, which is that I use never read from the chain read from the whole state.

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An unwritten back to it are, are may be in conflict, and so basically water is what matters first time ends and the power on the second guy to touch it or read from previously change sake, at which point, once you give you all the directions, Oh block blocks, finalized and all the whole thing is written, get into the ledger, and it's important to understand that this is not a theist, valid and even delicate.

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It's the single block and if you're saying okay, it's real real time, I spit out money validate later, that's a totally different. That's your application!.

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Okay, this is the overall again no rule set by Lex endorsements the stewardess service and delivers them back. So then we get to thought okay. Well, where did the etherion processed in here.

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Fact, I'm just walking out chain code, part of it, and so what we've written is a painkiller.

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And then, from the title of talking here in developers, man so obviously theory of developers not going to do a little this stuff. But if you want to provide sort of this behavior, you can talk about three and talk. But three is a common logarithm and, if used to talk to theory of nodes as well as.

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Yes, so you want me to be in these those tools to talk.

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So again, motivations is existing evm smart contracts out there on the rule, they've run against theory of networks, public private. But again it's here, April's, one rating, most contracts to you, Patrick deployments and theory problems and also provide a developer experience. That is the same as.

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So as long as everything you know, if you use the same languages, think I could eat and then we also want to provide this more interesting part which is Phoenix.

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So how are we with area.

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Yes, okay, so yeah we go over anyway in this fight, so okay, so on concept.

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Loser accounts and send a third which is the native token to other user accounts, and they can vote smart contracts. We're not going to support the native token part because it doesn't have native token, and we will support the user accounts for contracts and an interesting ask.

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The EDM is that contracts have accounts so once you deploy a contract contract is actually giving the ledger of area, and it is reachable under contract by talking to this gas. Whether interesting aspect would be via, and that is a basically eliminating the fact that you have certain amount of gas that will have to spend.

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Concept, so we basically, if I coded some ridiculous when I, guess or imputation and so any contract point being in missions, network you're not going to be gos thrown network. That's the short answer: anybody he's going to write a contract that takes up resources, you're going to know who it is its side there that signature, it is associates, and so this trans actually right now. So when contract during contract execution, you need read not he's from the world statement right nice to the world.

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Execute order validate process that we describe when you ask for the value you're asking for whatever the will say, pissed and remember, you can't change the world state until the block has been created and validated. So whenever you basically query a state recurring, whatever the state is when you've started not doing so, you may have written data, but you can't see what you've written in Sophie next hearing is not that way. If you're able you didn't write to an address and then read back from the address and.

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So we have to sort of financial ethereal idea of the world into fabric.

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Json-Rpc api is I've, been led to believe a very common way of interacting with the xperia no contract and it's a nice set of eight guys. We've implemented some of it, making enough of it to hook up remix for couple m3 and have success.

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Over all of the inside of it there's this basic sort of mesh basket system where each then you send data to an address and then a good response.

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So details know that the messages are all in this format, so to go field approach field so, for example, contract send, send via add a contracts.

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There is no contracts.

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Part that starts with user accounts with oyster counseling from and then the arguments to the contract are encoded in.

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The actual contract had most functions inside of it just a baby.

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The other interesting thing is my creation, and you do this by basically sending the byte code zero address. That's just sort of special.

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And so the return, the turn of this is going to be your freshly made and plug it in to the to address.

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So we've got two pieces results of all of these workers to pieces, the first one being the Ian chain code, detail and then the second one being a proxy that we want to add three cards. Two and.

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Three-Quarter you'll see the exact details.

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Okay, yes and then of course, and that's the RPC, because that's an ethereal API and of course you can talk directly to the Ian Cheney or that works beep. Here's the oh I lose, but it's the fast. We will talk to the Evo Jake sort of for you and translated material.

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So we have here sort of the blonde version of the pier and I know that we can see that the Union chain code is running. We have that cash I talked about the speed manager is the state manager talked to the weather, yep and our chain code is going new search and coverage is an important detail, not so much, but we are using.

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And then our fabric, the standard fabric, a chain of eight eyes, is two functions: ones.

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And we've got some special all those eyes. I would vote to do specific things for us, but the important thing is that the message, a message must have that you feel and is included in to notice from is missing from, is basically generated. Unmanned might be fabric public e automatically.

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And so now we will get the factory part of this and you can see that you've got the fabric Oh SDK. It ought to be painted API, and then we have the theory own server.

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Proxy talks to the e here.

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Here, ABI box correctly folks, it then a patient will ask you, remember p.m. stores its contract. It's gotta go where we the fabric ledger, to get the fabric. The TV here in chamber the heart contracts. Iii of my pop of letter writing the actual white coat. Let's do contract generating that that means second right set and again we end up with a fabric signed.

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Transactional trends actually goes back to there's no way back to the.

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Order orderly block here little validator and validators okay. So let's take a step back from this you and look at me sort of generic cerium Network, now known in this node, and this example once again that is just going the patient if you're in it talks to me.

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And then somebody who wants to interact with this network.

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Okay, so what if we replace all of this stuff to zero notice? What the interchange that didn't change.

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There's work toward each. We all know, that's part of the order to service ordering services.

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Don't really care about it or what we're trying to show I'm just trying to give you an outline of what network familiar with variation.

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And then you can see here, we've got four containers and you can see here, they're links, so it's one container for your note.

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What it looks like basically, this is the basic information you have here. There are a few things that you need to do figure that talks about right now. This is tiny different from like a gecko you can get in computer. You just type get in April figure it out and ask people for you that.

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We don't have a public network somebody work like I who do have some restrictions.

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The first basic thing you need is, if you're familiar again with separate development, SDKs that we expect those s in case of APA format and they've already produced standardized.

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It's not too much. This recommendation.

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This right, here kind of gives a basic to call the networks listed here at any sports. These are some of the fiercely to talk to and in the peers. Have enough information.

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There so once an S to care to talk to them, they have a wave bird, we're applying it to figure out what the whole all you don't have to write all of it down just enough to get started. This.

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Is also where you could say where.

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Your credentials are: where are what users, what for you are, and that kind of information it's kind of expected in a standardized orbital sander.

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From there, the other thing you need is the channel. We really talk about channel, they don't want to get too much into it and we're way to charge the network.

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Now the other two things.

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We keep all to keep the FCC, but really when you install and play that onto your network.

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And it really a good necessary for us to restricted. We want to change it, you can give you the ability to.

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It doesn't look like everyone.

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In the during a longer but contracts very cold world I think most blockchain networks have their own.

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Version of it and say key value store.

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Except there's only one door and.

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If you're, the million or three makes the next reporting to you, but this is a great tool if you're holding on in Syria, it was free to start compete. The details.

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Is second get their rate here, set basically JSON output that tells you the structure, contract and I will show it to a little bit later of why this is hopeful, but is.

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This is the arts to the cheating now.

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And see it shows up here.

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You can see here both counters, really look at three and there's nothing there. Okay, I'm going to copy this contractors way. I wanted your active they'll. Just go back to work out. Hydrated show us. This is the four piece of first line implying the core provider. This is basically where's the women fighter. How do I interact with the network I want to talk to you, I, have it running local low status, and that's where my fire is see we're using this library really just.

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The other thing right: here's like team I want to change this.

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In there remember before a group is zero. X I, don't care how to talk to you, yet you don't have to think about where the fabric specific limitations that can takes care of it. You talk how you normally talk.

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Now, let's go a few things just to see how the code looks like. So this is a voting API. This was straight up remix and it does.

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I'm a little bit plugging what we hear a little bit, but this is just in case you're not familiar, and there are familiar with developer.

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It's just kind of interesting kind of the motivation.

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Actually are having.

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The last thing over there is the application they just ran. It's all these. We modify it.

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If you come to us and say this is what I want to do face, it we're definitely open a.

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What would happen.

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It's there, but.

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If the one use case I've heard that I'm told like they actually played around and.

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They still want them every way. Certain transactions come back to us. Ask for some visa that necessarily there.

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So it really depends on what you want to do.

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Well, thank you we'll be here after.

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Bringing automation so that.

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The farmers we are going to provide the crops of your fans here- essentially services.

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That's what he spared me by Genesis, 14 onions, but one of the numbers he was literally on about 13 years.

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Was total over the last 30 years.

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There's alone maybe 770 versus them, but you know: there's 93.

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That's better than those facts. We should Bank securities. More than guys don't do sex they were actually equally did not be able to turn, but you know that concurrently, we only require tomorrow visible back to us.

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Yes, the to be started the project, it was an implication.

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2009 and fast forward today, we basically please.

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The challenges we're so when you polish on is actually reading this credit system. This is financial integrity. That's a buddy, mostly remote countries. You have legal organizations. There is the word that financial transactions of the banking family.

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First explanation we're very fortunate that we're talking about.

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So we basically.

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Basically, using eye candy health services, education services and also in financial services,.

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There's only two.

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Processors, in the first step, basically a citizen washing Bob, my first finger first and.

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Fill in the application, the I need dipping by the pool, and once you have a long leases.

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Why not religion? This is likely a movement that really did that this is back to the east.

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The borrower, the lender, also has to do with the bomb references them. So now one the two about there are five. Then.

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Know we started the project.

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By April of this year,.

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That's the goal.

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These are all the borrowers.

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