HyperLedger (Smart Contracts on Blockchain) & JavaScript Lightning Talk at JavaScript Meetup June 11, 2018

1. HYPERLEDGER
(SMART CONTRACTS ON BLOCKCHAIN)
& JAVASCRIPT
SEM Lightning Talk; June 11, 2018
Björn Simon @BjrnSmn

2. WHY IS THIS IMPORTANT?
• “What the internet did for communications, blockchain will do for
trusted transactions.” — Ginni Rometty (CEO of IBM)
• Potential to disrupt and improve across most industries
• Foundational Technology – “The next big thing”…
• Impact compared to invention of
• Internet &
• Open-Source
• For me, personally:
• Who do you trust with your data?
• How can I share securely on a need-to-know-bases and maintain
privacy?

3. USE CASES?
Source: https://youtu.be/gAxK6zYrfxI?t=89 IBM: Building Blockchain Apps With HyperLedger
Composer

4. USE CASES!
Source: https://youtu.be/gAxK6zYrfxI?t=112 IBM: Building Blockchain Apps With HyperLedger
Composer

5. MORE USE CASES!
• Goods tracking
• Shipments, food, e.g. track temperature & location via IoT sensors
• Fintech
• Sharing economies
• Energy
• Digital identify
• Identity, educational certificates/degrees, benefits
• Medical records
• Prevent human trafficking

6. BLOCKCHAIN, BITCOIN, HYPERLEDGER?
Peer-2-Peer
Crypto HashCrypto Hash
Distributed
Consensus
Blockchain
Crypto
Currency
Smart
Contracts
Ethereum +
Solidity
HyperLedger
Event
Processing
• Linux foundation, 2015, >140
members
• Focus on Smart Contracts &
decentralized enterprise
applications
• Scalability
• Node.js support
Bitcoin
ACL, Privacy

7. WHAT IS BLOCKCHAIN?
• Immutable, append only ledger
• Cryptographically hashed
Source: https://www.thoughtworks.com/insights/blog/blockchain-under-hood

8. WHAT IS BLOCKCHAIN?
• Trusted, distributed ledger
• Peer-2-peer
• Consensus
Source: https://en.bitcoinwiki.org/wiki/File:Peer-to-peer.png

9. HYPERLEDGER TOOLING
Source: https://youtu.be/gAxK6zYrfxI?t=576

10. EXAMPLE CODE (1)
/**.cto: Businesss definition */
namespace org.ex1
asset MyAsset identified by assetId {
o String assetId
--> MyParticipant owner
o String value
}
participant SampleParticipant
identified by participantId {
/*…*/ }
Source: https://composer-playground.mybluemix.net/editor
// Sample Asset:
{ "$class": "org.ex1.MyAsset",
"assetId": "assetId:1",
"owner": "resource:org.ex1.MyParticipant#Toby",
"value": "original value"
}
// Sample Participant:
{ "$class": "org.ex1.MyParticipant",
"participantId": "Toby",
"firstName": "Tobias", "lastName": "Hunter"
}

11. EXAMPLE CODE (2)
/**.cto: Businesss definition, part 2 */
transaction SampleTransaction {
--> MyAsset asset
o String newValue
}
event MyEvent {
--> MyAsset asset
o String oldValue
o String newValue
}
Source: https://composer-playground.mybluemix.net/editor
// Sample Transaction:
{"$class": "org.ex1.MyTransaction",
"asset": "resource:org.ex1.MyAsset#assetId:1",
"newValue": "new value"
}

12. EXAMPLE CODE (3)
/** Transaction processing .js */
async function sampleTransaction(tx) {
const oldValue = tx.asset.value;
...
const assetRegistry = await getAssetRegistry('org.ex1.MyAsset');
// Update asset in registry
await assetRegistry.update(tx.asset);
// Emit event for modified asset
let event = getFactory().newEvent('org.ex1', ‘MyEvent');
...; emit(event);
}
Source: https://composer-playground.mybluemix.net/editor

13. HOW TO RUN HYPERLEDGER?
• Run in browser: https://composer-playground.mybluemix.net/
• Local Docker: https://hyperledger.github.io/composer/latest/installing/installing-
index.html
• Cloud
• AWS: https://aws.amazon.com/blockchain/
• Azure: https://azure.microsoft.com/en-us/solutions/blockchain/
• IBM: https://www.ibm.com/blockchain/hyperledger
• Oracle: https://www.oracle.com/cloud/blockchain/index.html
• …

14. FURTHER RESOURCES
• https://www.computerworld.com/article/3191077/security/what-is-
blockchain-the-most-disruptive-tech-in-decades.html
• https://medium.com/@madronaventurelabs/building-enterprise-
blockchain-applications-in-hyperledger-8d869bb214d9
• https://www.slideshare.net/SimonStone8/hyperledger-composer-
architecture
• Blockchain visual demo: https://anders.com/blockchain/
• https://www.hyperledger.org/projects/sawtooth &
https://github.com/hyperledger
• https://www.linkedin.com/pulse/git-blockchain-dave-mercer/
• https://www-
01.ibm.com/events/wwe/grp/grp308.nsf/vLookupPDFs/blockchain%20ar
chtage/$file/blockchain%20archtage.pdf

15. QUESTIONS?
• Thank you!