Introducing Blockchain to web developers

If you haven’t heard about blockchain, you probably know Bitcoin. Blockchain is the underlying technology that powers Bitcoin. Although it was created to support Bitcoin, the blockchain concept can be defined regardless of the Bitcoin ecosystem. Experts say that blockchain will cause a revolution similar to the one enabled by the advent of the Internet. But what is it really, and how can it be used to build apps today? In this talk, Badi explains the blockchain phenomenon to developers who primarily build web and mobile apps. You’ll understand the fundamentals of blockchain and how to get started with building apps with it.

Transcript

1. Introducing Blockchain to web developers Badi Sudhakaran @badikumar
4. Centralized Britannica Decentralised/Distributed Wikipedia
5. Free flow of information Internet Free flow of value Blockchain
6. Bitcoin – A quick primer
7. How Bitcoin works
8. Centralized Ledger Bank L Distributed Ledger Blockchain L L L L L L L L L L
9. Who updates the ledger on the blockchain •Updated every 10 minutes •Miners compete for right to update •More processing power means more chance to win
10. L L L L L L L L L L Achieving consensus on the blockchain
11. L L L L L L L L L L Achieving consensus on the blockchain
12. Achieving consensus on the blockchain L L L L L L L L L L
14. 5b878847d7f1d5b8fdeb14d54a143deaf 00ceeafe08a770023327e30eeefdc8c Feaceb488037fb9ecf4c66071de344cdb5 ab1f2a45d56c84fa942a088a0c5974 888aa3a6976bfd7a25dd4fcdf56c3ea717 284a54f5e8a01312e811dde9fb1ca2 5b878847d7f1d5b8fdeb14d54a143deaf 00ceeafe08a770023327e30eeefdc8c Feaceb488037fb9ecf4c66071de344cdb5 ab1f2a45d56c84fa942a088a0c5974 888aa3a6976bfd7a25dd4fcdf56c3ea717 284a54f5e8a01312e811dde9fb1ca2 5b878847d7f1d5b8fdeb14d54a143deaf 00ceeafe08a770023327e30eeefdc8c Feaceb488037fb9ecf4c66071de344cdb5 ab1f2a45d56c84fa942a088a0c5974 888aa3a6976bfd7a25dd4fcdf56c3ea717 284a54f5e8a01312e811dde9fb1ca2 5b878847d7f1d5b8fdeb14d54a143deaf 00ceeafe08a770023327e30eeefdc8c Feaceb488037fb9ecf4c66071de344cdb5 ab1f2a45d56c84fa942a088a0c5974 888aa3a6976bfd7a25dd4fcdf56c3ea717 284a54f5e8a01312e811dde9fb1ca2
15. Blockchain – Distributed Ledger •Transparency •Permanence •Auditing •Immutable •Authentication L L L L L L L L L L
16. Blockchain technology presents an alternative wherever a trusted intermediary currently operates
17. Blockchain Examples: •Sovereign Blockchain •Trading Platforms •Property registrations and transfers •Registration of births and deaths •Verification of academic records
18. Decentralization presents opportunities for centralization
23. Where do I fit in as a developer?
24. Clients Web server with Node.js® Blockchain node (local/remote) HTTP/S JavaScript Library Typical application architecture
25. Example: bitcoinjs • npm install bitcoinjs-lib • Create a new bitcoin address with a private key: var bitcoin = require(‘bitcoinjs-lib’) var keyPair = bitcoin.ECPair.makeRandom({ rng: rng }) var wif = keyPair.toWIF() var address = keyPair.getAddress()
26. Example: bitcoinjs • Create a new transaction moving bitcoin around: var tx = new bitcoin.TransactionBuilder() tx.addInput(transactionId, 0) tx.addOutput(address,15000) tx.sign(0, keyPair) tx.build().toHex() var tx = new bitcoin.TransactionBuilder(bitcoin.networks.testnet)
27. Blockchain implementations
28. Web3.js Developer SDK/API CryptoCoinJS ethereumjs Core Fabric SDK
29. Summary
30. As the Internet decentralized information, Blockchain will decentralize everything else. The opportunities are endless…
31. Thank you! Badi Sudhakaran @badikumar bkumar@iqbusiness.net www.devconf.co.za/rate