Deployablockchainwebappwithhyperledgerfabricpresentation 190820170703
- 1. Deploy a blockchain web-app with Hyperledger Fabric Horea Porutiu Advisory Software Engineer, IBM July 2019 Blockchain Architected Blockchain Explored Blockchain Solutions Blockchain Composed Next Steps Blockchain Explained IBM Blockchain Platform
- 2. 2 By a show of hands… 1. Understands how blockchains work? 2. Know what Hyperledger Fabric is? 3. Developed a smart contract? 4. Developed a dapp? 5. Deployed a network to production? ✋🏼 ⛓
- 3. 3 What you will learn 1. Blockchain vocabulary 📖
- 4. 4 What you will learn 1. Blockchain vocabulary 2. A use-case of blockchain 📖 ✅
- 5. 5 What you will learn 1. Blockchain vocabulary 2. A use-case of blockchain 3. Architecture behind a Hyperledger Fabric solution 📖 ✅ 🚧
- 6. 6 What you will learn 1. Blockchain vocabulary 2. A use-case of blockchain 3. Architecture behind a Hyperledger Fabric solution 4. Difference between the world state and the ledger 📖 ✅ 🚧 📒
- 7. 7 What you will learn 1. Blockchain vocabulary 2. A use-case of blockchain 3. Architecture behind a Hyperledger Fabric solution 4. Difference between the world state and the ledger 5. Difference between public and private blockchains 📖 ✅ 🚧 📒 🔓
- 8. 8 What you will learn 1. Blockchain vocabulary 2. A use-case of blockchain 3. Architecture behind a Hyperledger Fabric solution 4. Difference between the world state and the ledger 5. Difference between public and private blockchains 6. How a client application invokes a smart contract 📖 ✅ 🚧 📒 🔓 🏼
- 9. 9 Security: Public vs. private blockchains •Bitcoin •Users treated equally •Identity is anonymous Public blockchains
- 10. 10 Security: Public vs. private blockchains •Bitcoin •Users treated equally •Identity is anonymous Public blockchains Private blockchains •Hyperledger Fabric, Quorum •Network members known, transactions can be secret
- 11. 11 Security: Public vs. private blockchains • Identity management (anonymous vs. known) •Bitcoin •Users treated equally •Identity is anonymous Public blockchains Private blockchains •Hyperledger Fabric, Quorum •Network members known, transactions can be secret
- 12. 12 Security: Public vs. private blockchains • Identity management (anonymous vs. known) • Most business use-cases require private, permissioned blockchains – Network members know who they’re dealing with (KYC) – Membership is controlled •Bitcoin •Users treated equally •Identity is anonymous Public blockchains Private blockchains •Hyperledger Fabric, Quorum •Network members known, transactions can be secret
- 13. 13 A ledger often consists of two data structures • Blockchain o A linked list of blocks o Each block describes a set of transactions (e.g. the inputs to a smart contract invocation) o Immutable – blocks cannot be tampered block txn txn txn Blockchain
- 14. 14 A ledger often consists of two data structures • Blockchain o A linked list of blocks o Each block describes a set of transactions (e.g. the inputs to a smart contract invocation) o Immutable – blocks cannot be tampered • World State o An ordinary database (e.g. key/value store) o Stores the combined outputs of all transactions o CAN deleteWorld state block txn txn txn Blockchain
- 15. 15 Block detail (simplified) -New blocks always added to the end Block 16 Prev Block Hash: 57ec2fda71 Block Hash: 87ea2ffe94 Block Hash: 57ec2fda71 Block 15 Prev Block Hash: d68b2f0a3b Block 17 Prev Block Hash: 87ea2ffe94 Block Hash: 44bf2efe32 Transaction Transaction Transaction Transaction Transaction Transaction … …
- 16. 16 Block detail (simplified) -New blocks always added to the end -Each block header includes a hash of the current block transactions and the previous block’s transactions Block 16 Prev Block Hash: 57ec2fda71 Block Hash: 87ea2ffe94 Block Hash: 57ec2fda71 Block 15 Prev Block Hash: d68b2f0a3b Block 17 Prev Block Hash: 87ea2ffe94 Block Hash: 44bf2efe32 Transaction Transaction Transaction Transaction Transaction Transaction … …
- 17. 17 What is Hyperledger Fabric • Platform for distributed ledger solutions 📒
- 18. 18 What is Hyperledger Fabric • Platform for distributed ledger solutions • Open Source – Contributions by hundreds of engineers from tens of organizations 📒 👨🏼💻👩🏼💻
- 19. 19 What is Hyperledger Fabric • Platform for distributed ledger solutions • Open Source – Contributions by hundreds of engineers from tens of organizations • Features – Smart Contracts (updates the ledger) – Consensus (synch ledger across network) – Privacy (channels) 🔒 📒 👨🏼💻👩🏼💻
- 20. 20 Blockchain User Membership Services Blockchain Developer Blockchain Network Operator Blockchain B2B transactions access to logic access to data creates applications operates accesses security certificates Regulator performs oversight Traditional Data Sources Traditional Processing Platforms R U D O Blockchain Architect A designs Actors in a blockchain solution
- 21. 21 The blockchain developer Blockchain Developer D f(abc); Smart Contract Blockchain developers’ primary interests are… Application
- 22. 22 Ledger … The blockchain developer Blockchain Developer D f(abc); Smart Contract Blockchain developers’ primary interests are… …and how they interact with the ledger and other systems of record: Systems IntegrationEvents ! Traditional Data Sources Traditional Processing Platforms Application
- 23. 23 Components in a blockchain solution Ledger List of transactions maintained by peers…
- 24. 24 Components in a blockchain solution Smart Contract Ledger List of transactions maintained by peers f(abc); Software running on peer, updates the world state …
- 25. 25 Components in a blockchain solution Smart Contract Peer Network Ledger List of transactions maintained by peers f(abc); Software running on peer, updates the world state … Network which reaches consensus to add blocks
- 26. 26 Components in a blockchain solution Membership Smart Contract Peer Network Ledger List of transactions maintained by peers f(abc); Software running on peer, updates the world state … E T Network which reaches consensus to add blocks Authenticates and manages identities on network
- 27. 27 Components in a blockchain solution Membership Smart Contract Events Peer Network Ledger List of transactions maintained by peers f(abc); Software running on peer, updates the world state … E T Network which reaches consensus to add blocks Authenticates and manages identities on network Emits notifications of operations on network!
- 28. 28 Components in a blockchain solution Membership Smart Contract Systems Management Events Peer Network Ledger List of transactions maintained by peers f(abc); Software running on peer, updates the world state … E T Network which reaches consensus to add blocks Authenticates and manages identities on network Emits notifications of operations on network Enables us to create/monitor blockchain componentsi !
- 29. 29 Components in a blockchain solution Membership Smart Contract Systems Management Events Peer Network Wallet Ledger List of transactions maintained by peers f(abc); Software running on peer, updates the world state … E T Network which reaches consensus to add blocks Authenticates and manages identities on network Emits notifications of operations on network Enables us to create/monitor blockchain components Securely manages a user’s credentials i !
- 30. 30 Components in a blockchain solution Membership Smart Contract Systems Management Events Peer Network Wallet Ledger List of transactions maintained by peers f(abc); Software running on peer, updates the world state … E T Network which reaches consensus to add blocks Authenticates and manages identities on network Emits notifications of operations on network Enables us to create/monitor blockchain components Securely manages a user’s credentials i Systems Integration Integrate blockchain with eternal systems !
- 31. 31 Smart Contracts Smart Contracts contain the business logic deployed to peers
- 32. 32 Smart Contracts Smart Contracts contain the business logic deployed to peers • Interact with the world state through the Fabric shim interface
- 33. 33 Smart Contracts Smart Contracts contain the business logic deployed to peers • Interact with the world state through the Fabric shim interface • Language support for: – Golang – Node.js – Java
- 34. 34 Smart Contracts Smart Contracts contain the business logic deployed to peers • Interact with the world state through the Fabric shim interface • Language support for: – Golang – Node.js – Java Smart ContractPeer Client Application SDK Invoke() Admin Install Instantiate Init()
- 35. 35 Client Application Client applications use Fabric SDK to: • Connects over channels to peer and orderer nodes • Provide public / private keys ! Events Channels Client Application SDK 🔑
- 36. 36 Client Application Client applications use Fabric SDK to: • Connects over channels to peer and orderer nodes • Provide public / private keys Connection Profile • Network end-points and connection parameters • The gateway to submit transactions to a Hyperledger Fabric network ! Events Channels Client Application SDK Local MSP • Connection Parms • Credential Store • Channels • Organisations • Orderers • Peers • CAs Connection Profile 🔑
- 37. 37 Blockchain developer Smart Contract submitsdevelops develops recorded accesses event emits emits D Ledger ‘get’, ‘put’, ‘delete’ Client Application SDK ! ! World state block txn txn txn Blockchain Peer event How applications interact with the ledger
- 38. 38 Sample blockchain use-case: e-voting
- 39. 39 Components in an e-voting blockchain solution Ledger The ledger containing history of submitted votes…
- 40. 40 Components in an e-voting blockchain solution Smart Contract Ledger The ledger containing history of submitted votes f(abc); voterContract. Registers voters & submits votes …
- 41. 41 Components in an e-voting blockchain solution Smart Contract Peer Network Ledger The ledger containing history of submitted votes f(abc); voterContract. Registers voters & submits votes … The peers which run the voterContract
- 42. 42 Components in an e-voting blockchain solution Membership Smart Contract Peer Network Ledger The ledger containing history of submitted votes f(abc); voterContract. Registers voters & submits votes … E T The peers which run the voterContract Public and private key for each registered voter
- 43. 43 Components in an e-voting blockchain solution Membership Smart Contract Events Peer Network Ledger The ledger containing history of submitted votes f(abc); voterContract. Registers voters & submits votes … E T The peers which run the voterContract Public and private key for each registered voter Emit events to when a transaction is complete!
- 44. 44 Components in an e-voting blockchain solution Membership Smart Contract Systems Management Events Peer Network Ledger The ledger containing history of submitted votes f(abc); voterContract. Registers voters & submits votes … E T The peers which run the voterContract Public and private key for each registered voter Emit events to when a transaction is complete VSCode extension to manage nodes & networki !
- 45. 45 Components in an e-voting blockchain solution Membership Smart Contract Systems Management Events Peer Network Wallet Ledger The ledger containing history of submitted votes f(abc); voterContract. Registers voters & submits votes … E T The peers which run the voterContract Public and private key for each registered voter Emit events to when a transaction is complete VSCode extension to manage nodes & network Stores our voter’s public/private keys and certs i !
- 46. 46 Components in an e-voting blockchain solution Membership Smart Contract Systems Management Events Peer Network Wallet Ledger The ledger containing history of submitted votes f(abc); voterContract. Registers voters & submits votes … E T The peers which run the voterContract Public and private key for each registered voter Emit events to when a transaction is complete VSCode extension to manage nodes & network Stores our voter’s public/private keys and certs i Systems Integration An API to validate voter registration (DMV API) !
- 48. Concepts and Components Considerations for the Developer, Operator and Architect
- 49. 49 Working with the ledger example: a change of ownership transaction World state Transaction input - sent from application invoke(voterContract, castVote, 2020election, 123123123, democrat) txn txn txn Application f(abc); Smart Contract
- 50. 50 Working with the ledger example: a change of ownership transaction World state Transaction input - sent from application invoke(voterContract, castVote, 2020election, 123123123, democrat) Smart contract implementation castVote(ctx, args) { args.democrat.count++ } txn txn txn Application f(abc); Smart Contract
- 51. 51 Working with the ledger example: a change of ownership transaction World state Transaction input - sent from application invoke(voterContract, castVote, 2020election, 123123123, democrat) democrat.count = 1 voterId.castBallot = true World state: new contents Smart contract implementation castVote(ctx, args) { args.democrat.count++ } txn txn txn Application f(abc); Smart Contract
- 52. 52 Working with the ledger example: a change of ownership transaction World state Transaction input - sent from application invoke(voterContract, castVote, 2020election, 123123123, democrat) democrat.count = 1 voterId.castBallot = true World state: new contents Smart contract implementation castVote(ctx, args) { args.democrat.count++ } txn txn txnDemocrat.co unt = 1 Application f(abc); Smart Contract
- 53. 53 Working with the ledger example: a change of ownership transaction World state Transaction input - sent from application invoke(voterContract, castVote, 2020election, 123123123, democrat) democrat.count = 1 voterId.castBallot = true World state: new contents Smart contract implementation castVote(ctx, args) { args.democrat.count++ } txn txn txnDemocrat.co unt = 1 “Invoke, voterContract, castVote, 2020election, 123123123, democrat” Application f(abc); Smart Contract
- 54. 54 E-voting Demo
- 55. 55 What we learned 1. Blockchain vocabulary 2. A use-case of blockchain 3. Architecture behind a Hyperledger Fabric solution 4. Difference between the world state and the ledger 5. Difference between public and private blockchains 6. How a client application invokes a smart contract 📖 ✅ 🚧 📒 🔓 🏼
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