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Blockchain workshop IBM CODE Day - Montevideo
- 2. Blockchain Workshop: Develop and deploy applications using Hyperledger Fabric & Composer Horea Porutiu Developer Advocate IBM June 12, 2018
- 3. Slides @horeaporutiu 1. Go to my twitter - @horeaporutiu 2. Link to my slide share is the first pinned tweet
- 4. Agenda @horeaporutiu 1. Blockchain overview 2. Hyperledger Fabric & Composer overview 3. Live Coding 4. Live Deployment
- 5. Problem Bank records Party A’s records Party C’s records Auditor records Party B’s records Party D’s records • Today’s business networks: inefficient, expensive, vulnerable @horeaporutiu
- 6. Problem @horeaporutiu Fisherman Processor Distributor Plate • There are so many parties involved • Different parties have different incentives • Hard to trust that your fish is actually organic Traceability of fish from ocean to plate
- 7. Solution Bank records Party A’s records Party C’s records Auditor records Party B’s records Party D’s records Shared, replicated, permissioned ledger @horeaporutiu Blockchain benefits: consensus, provenance, immutability, and finality
- 8. What is blockchain? • Blockchain - a continuously growing list of records, called blocks, which are linked and secured using cryptography. • A digital ledger that is replicated across all network participants @horeaporutiu • Network participants collaborate to maintain the ledger
- 9. Types of blockchain Public Private @horeaporutiu • Open to anyone • Large computational requirement • Participants incentivized with cryptocurrency • Bitcoin • Need permission to join the network • Walmart solution • Less computational power required • Cryptocurrency is typically not involved • Transactions can be kept private
- 10. Identify blockchain use-cases • If data is used only by one organization, then it’s most likely not a good use of blockchain @horeaporutiu Distributed Ledger Distributed Smart ContractsImmutable Share data across multiple companies Permanent record of transactions No central point of ownership Business rules visible to all members
- 11. Hyperledger • A collaborative effort created to advance cross-industry blockchain tech for business • Hyperledger is an umbrella – 5 frameworks, 4 tools under Hyperledger @horeaporutiu • Announced in 2015, now over 180 members
- 12. Hyperledger Fabric • An implementation of blockchain technology used as a foundation for developing blockchain applications @horeaporutiu • V1.0 released July 2017 • 27 organizations, 159 developers
- 13. Hyperledger: Writing Smart Contracts • Either as native chain code – using Go, Java, or Node.js @horeaporutiu • Hyperledger Composer – Easy way to write smart contracts w/ JavaScript https://medium.com/@olivier.mathurin/build-a-blockchain-prototype-in-minutes-with-hyperledger- composer-e132e17c98c7
- 15. Generate network archive - .bna file @horeaporutiu Model File .cto Access Control Script File .js Assets, participants, and transactions Transaction functions Access Control Rules Business Network Packaged business network definition Archive .bna .acl networkadmin.card Credentials for admin of the network
- 16. Writing your first model file (.cto) @horeaporutiu 1. namespace 2. Participants 3. Assets 4. Transactions 5. Events Need to define the following: 🙋🏽♀️🙋🏽♂️ 🏽 💰 ‼️ 🔡 Need more help? Check this tutorial: https://www.skcript.com/svr/writing-your-first-business-model-in- hyperledger-composer/
- 18. Contact • Questions: horea.porutiu@ibm.com • Social: Tweets @horeaporutiu • Site: https://horeaporutiu.github.io/ @horeaporutiu
Editor's Notes
- before we get started, by a show of hands, how many of you know about blockchain? How many have taken a course or been to class on blockchain? How many have developed applications using blockchain technoloies? Well no matter your skill level, and familiarity with blockchain, I think you will be able to learn something useful from this session. Today, I want to take you through a journey with blockchain. I’ll go over the main concepts of blockchain, and more importantly, when blockchain is a suitable solution for your problem. I’ll talk about Hyperledger, a popular open source technology for building blockchain applications and then I’ll go into a demo of how to start building blockchain apps with Hyperledger, and then go into Q/A.
- before we get started, by a show of hands, how many of you know about blockchain? How many have taken a course or been to class on blockchain? How many have developed applications using blockchain technoloies? Well no matter your skill level, and familiarity with blockchain, I think you will be able to learn something useful from this session. Today, I want to take you through a journey with blockchain. I’ll go over the main concepts of blockchain, and more importantly, when blockchain is a suitable solution for your problem. I’ll talk about Hyperledger, a popular open source technology for building blockchain applications and then I’ll go into a demo of how to start building blockchain apps with Hyperledger, and then go into Q/A.
- So earlier I talked about the food industry and how they could benefit from a blockchain solution for their supply chain. But to be fair, blockchain doesn’t have to be limited to the supply chain Any industry where goods and services change hands has this problem Existing business network: when their ledger disagree, need to go to the court…no agreement there Everyone has to maintain their own private ledger, and is vulnerable for this problem too
- The problem here becomes, how do I trust that this fish is organic? I mean, the fish changes hands from fisherman, to processor, to distributer, to the market. What if someone along the way made a mistake? Then I’m paying more for the same quality How do I trust that this fish is actually wild, and not just marketed as so?
- So here we see that in a typical solution, there are multiple parties that are working together in a businessss network. We have The bank, the auditor, the the farmer, the processor, the distributor, and the retailer Blockchain is a trusted distributed ledger Way for business to share data when they don’t necessarily trust each other Solve this problem by providing a single source of truth by the use of a shared and replicated ledger Blockchain tech ensures that everyone has the same copy of the ledger 4 key aspects Consensus: when anyone wants to add a change to the blockchain, a set of participants need to agree that that transaction has occurred. So if participant A does a trade with participant B, then maybe the bank and the auditor might get involved and sign off on that. Blockchain tech will provide WHO has to endorse the transactions before they get added to the ledger Provenance: can show history of where you caught your fish Immutable: can’t go back and change the ledger. If you try and change your copy of the ledger, since the ledger is replicated, none of the other ledgers will agree, easy to see that you tampered with ledger Finality: ledger is the simple source of truth. can’t disagree with blockchain since everyone agrees with the updates…it is the single source of truth
- So here is the mandatory definition slide The main points here is that blockchain is a list of records, which enables participants to transact with each over a network with TRUST. also, the ledger is replicated across all participants, so everyone in the network has a single source of truth
- Explain private vs public, and what each means What is a public blockchian, is private hyperledger a blockchain implementation?
- Usually, the first sign that blockchain is not right for your solution is if you are not dealing with multiple organizations. On the other hand, if you need permanent record of transactions and lack trust between the different organizations, then blockchain might be a possible solution for your problem.
- So here is the mandatory definition slide The main points here is that blockchain is a list of records, which enables participants to transact with each over a network with TRUST. also, the ledger is replicated across all participants, so everyone in the network has a single source of truth
- So here is the mandatory definition slide The main points here is that blockchain is a list of records, which enables participants to transact with each over a network with TRUST. also, the ledger is replicated across all participants, so everyone in the network has a single source of truth
- So here is the mandatory definition slide The main points here is that blockchain is a list of records, which enables participants to transact with each over a network with TRUST. also, the ledger is replicated across all participants, so everyone in the network has a single source of truth
- So here is the mandatory definition slide The main points here is that blockchain is a list of records, which enables participants to transact with each over a network with TRUST. also, the ledger is replicated across all participants, so everyone in the network has a single source of truth
- So here is the mandatory definition slide The main points here is that blockchain is a list of records, which enables participants to transact with each over a network with TRUST. also, the ledger is replicated across all participants, so everyone in the network has a single source of truth
- So here is the mandatory definition slide The main points here is that blockchain is a list of records, which enables participants to transact with each over a network with TRUST. also, the ledger is replicated across all participants, so everyone in the network has a single source of truth
- So here is the mandatory definition slide The main points here is that blockchain is a list of records, which enables participants to transact with each over a network with TRUST. also, the ledger is replicated across all participants, so everyone in the network has a single source of truth