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Wwc developing hyperledger applications v2
1. An Introduction to Blockchain and
Hyperledger
Lennart Frantzell
IBM Developer Advocate
San Francisco
alf@us.ibm.com
V1.2 February 1 2019
Blockchain Explored Series
IBM Blockchain Platform Explored
Fabric Explored
Composer Explored
What’s New
Architectures Explored
5. 5
The Ledger problem
inefficient, expensive, vulnerable
Participant A’s records Participant B’s records Bank records
Insurer records Regulator records Auditor records
6. 6
Blockchain
Participant A’s records Participant B’s records Bank records
Insurer records Regulator records Auditor records
The Ledger Solution
A shared, replicated, permissioned ledger…
…with consensus, provenance, immutability and finality
8. 8
Linux Foundation Open Source Hyperledger
•
App Layer: Hyperledger Sawtooth
Supply Chain
Cargill
https://sawtooth.hyperledger.org/examples/seafood.html
In December 2015, the Linux Foundation announced the creation of the Hyperledger Project.
Visual Studio Code
9. Roadmap
• Channels
• Selective endorsement
• SOLO/Kafka orderers
• LevelDB or CouchDB
• Javascript chaincode
• Connection profile
• Encryption library
• Attribute access control
• CouchDB indexes
• Channel based events
• ACLs
• Service discovery
• Pluggable endorsement and validation
• Private Data Collections
• State based endorsement
• Java chaincode
• CouchDB pagination
• Identity Mixer
• Local collections
• SDK improvements
• Lifecycle changes
• Revocation for Idemixer
• Tokenisation
• RAFT
• Operational metrics and logging
• SDK and SHIM improvements
• Burrow EVM
• Long Term Service (LTS) support
07/17 03/18 06/18 10/18 4Q/18
*
1Q/19
*
Based on https://wiki.hyperledger.org/projects/fabric/roadmap - Dates determined by the Hyperledger community - (*) Subject to change
v1
v1.1
v1.2
v1.3
v1.4
v2.0
11. 11
Pluggable Consensus
• https://www.slideshare.net/MattLucas3/blockchain-whats-new-in-hyperledger-fabric-oct-2018
• This modular architecture allows the platform to rely on well-established toolkits for
CFT (crash fault-tolerant) or BFT (byzantine fault-tolerant) ordering.
• In the currently available releases, Fabric offers a CFT ordering service implemented
with Kafka and Zookeeper. Kafka is fault tolerant, but not Byzantine fault tolerant
• In subsequent releases, Fabric will deliver a Raft consensus ordering service
implemented with etcd/Raft and a fully decentralized BFT ordering service.
12. 12
Hyperledger Fabric components
• Hyperledger has three components:
– membership services – which manages digital certificates and access,
– ordering service – which keeps the peers in alignment,
– and peers – which hold the ledger.
• A peer is also where chaincode, also known as smart contracts, are executed.
• Membership and ordering services align well to being centralized.
– Peers, on the other hand, can be distributed and placed anywhere you desire in the
world.
– Each member of the Hyperledger network should have their own peer.
– The channels (databases) that a peer subscribes to, and transacts against, determines
the member’s role and capabilities in the blockchain network.
https://www.ibm.com/blogs/systems/blockchain-how-should-you-organize-your-peers/
14. 14
IBM Blockchain Platform
Platform Architecture Overview
Application SDK
Membership
Services
Peer
Endorser
Ledger
Committer
A
Chaincode B
!Events
Ordering-Service
O
O
O
Fabric-CAExternal-CA
optionaloptional Admin
Users
CACA
Hardware
Security
Module(*)
IBP UI
(*) Enterprise Plan
Certificate
Authority
IBM Blockchain
Platform
15. 15
The Ledger, Blockchain and World State Database
https://hyperledger-fabric.readthedocs.io/en/release-1.4/ledger/ledger.html#example-ledger-fabcar
world state – a database that holds a cache of
the current values of a set of ledger states.
The world state makes it easy for a program
to directly access the current value of a state
rather than having to calculate it by traversing
the entire transaction log (= Blockchain).
16. 16IBM Blockchain Platform
How applications interact with the IBM Blockchain
Platform
Blockchain
Developer
Develops
Chaincode
Submits
0 1 2 3
Ledger
Blockchain WorldState
Get, Put, Delete
Record
SDK
Application
!
Emits
Emits
!
Peer
Accesses
18. 18
What makes a good Blockchain Use Case?
•
• A Business problem that cannot easily be solved
with existing techniques
• An identifiable business network
• With a shared ledger
• With Participants, Assets and Transactions
• A need for embedded trust but no Trusted Third
Party
22. 22
3) Re-use IBM Code Patterns for Blockchain
• IBM Code Patterns for Blockchain: https://developer.ibm.com/patterns/category/blockchain/
• 10 Lessons: Design Thinking for Blockchain
https://www.ibm.com/blogs/insights-on-business/government/10-lessons-design-thinking-blockchain/
38. 38
Where do we go from here?
LinkedIn: lennartfrantzell
IBM Blockchain: https://www.ibm.com/blockchain
Build for free on IBM Cloud: https://ibm.biz/Bd2L5W
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