Dive deep into blockchain

Blockchain became very popular due to the cryptocurrencies boom in the last few years. It is an interesting technology choice, but with every advantage comes a challenge that needs to be thoroughly reviewed and addressed. Feedback: https://joind.in/talk/2fdb3 .

Transcript

1. blockchain dive deep into Tomasz Kowalczyk @tmmx
4. blockwhat?
5. database
6. chain of blocks
7. block of data
8. data structure
9. cryptocurrency
10. general purpose
11. blockwhy?
12. immutability
13. append only
14. traceability
15. verifiability
16. tamper proof
17. integrity
18. reproducibility
19. decentralization
20. trust(less)
21. transparency
22. blockwhen?
23. voting medical records cloud storage financial transactions decentralized messaging property registry land sales insurance digital wallets smart contracts crowdfunding property ownership social networking P2P finances virtual countries asset trading
24. few hours later...
25. loyalty programs internal currency regulatory reporting cross-border payments smart contracts ecommerce digital identity anti-counterfeiting mechanisms
26. blockhow?
27. public shared private
28. cryptography
29. addresses
30. hash algorithm
31. Merkle tree aka. binary hash tree
32. A B C D HAB HCD R B Merkle path: R-HAB-HB HA HB HC HD
33. genesis block
34. consensus
35. proof of work proof of stake
36. example
37. Hashchain?
38. $storage = new SqliteStorage('chain.sq3'); $signer = new OpenSslSigner('private.key', 'public.key'); $genesis = new GenesisBlock('fiat lux'); $state = new State(); $chain = new Hashchain($storage, $signer, $genesis, $state); $chain->createBlock(new CreateAccount('A', 'Alpha')); $chain->createBlock(new CreateAccountWithCredits('Z', 'Zulu', 1000)); $chain->createBlock(new SendCredits('Z', 'A', 100));
39. // Not enough credits: Z sent 100 to A and has only 900! $chain->createBlock(new SendCredits('Z', 'A', 1000)); // Sender X does not exist! $chain->createBlock(new SendCredits('X', 'A', 1000)); // Account Zulu already exists! $chain->createBlock(new CreateAccount('Z', 'Zulu'));
40. challenges
41. conflict resolution
42. integration with existing systems
43. performance scalability throughput
44. mining and incentives rewards for maintaining network nodes
45. security
46. privacy
47. hard forks
48. summary
49. right solution for the right kind of problem
50. Event Sourcing (on steroids)
51. scratching surface
52. BlocQuestions?
53. Slides https://speakerdeck.com/thunderer/dive-deep-into-blockchain Resources http://www.imponderablethings.com/2013/07/how-bitcoin-works-under-hood.html http://chimera.labs.oreilly.com/books/1234000001802/index.html (Mastering Bitcoin) https://www.coindesk.com/math-behind-bitcoin (EC) https://en.wikipedia.org/wiki/Four_Knights_Game (Chess) http://queue.acm.org/detail.cfm?id=3136559 (Bitcoin) https://blog.acolyer.org/2017/08/30/a-concurrent-perspective-on-smart-contracts (smart contracts) https://en.bitcoin.it/wiki/Secp256k1 (Bitcoin Elliptic Curve) Pictures (Creative Commons) https://www.flickr.com/photos/skyseeker/14404947216 (lightning) https://www.flickr.com/photos/atermath/3053484935 (stripes) https://www.flickr.com/photos/randnotizenorg/32110828536 (electronic) https://www.flickr.com/photos/23221002@N00/7204014842 (equations) https://www.flickr.com/photos/spookyamd/14184019077 (mountain) https://www.flickr.com/photos/s1ng0/5445857570 (trees) https://www.flickr.com/photos/95213174@N08/10329928973 (handshake) https://www.flickr.com/photos/wiertz/4563720850 (signature) https://www.flickr.com/photos/33279673@N03/5482493912 (chains)
54. please rate the talk and give feedback on joind.in/talk/74cb2
55. Thankschain! github /thunderer twitter @tmmx