2018 - How the Rubyist use Blockchain

The talks about ruby and blockchain in rubyelixirconftw.

Transcript

1. How the Rubyist use Blockchain
2. WEB DEVELOPER GAME DEVELOPER 襟 儘 䓛⛳ @elct9620
4. I will talk about What is the Blockchain The examples use Ruby and Ethereum
5. What is the Blockchain
6. Linked List Cryptography Key-Value Data Store Distributed System
7. There is nothing new for us
9. Cryptocurrency
11. So, how the Blockchain works?
12. Chain =~ Linked List
13. The Chain Block #1 Block #2 Block #3 Pointer Pointer
14. Ok, I think you already learned it!
15. But, we have to limit anyone to write it!!!
16. 1. Proof of Work
17. 1. Prevent mass request from somebody 2. Other people can verify in short time Cryptography
18. Use cryptography to resolve question!
19. Cryptography Network Hash start with “000” Workers Define a Question Broadcast
20. Cryptography Workers 000abcdefaaabc… Network Try hash block Submit
21. Cryptography Network 000abcdefaaabc Block Created Verify result Accept
22. Wait! The same content will get the same hash result!
24. We add a random “Proof” string with block data
25. So, the worker should spend the time
26. And others can check it in short time
27. If we receive many correct answers…
28. Which one should accept?
29. 2. Byzantine Generals Problem
30. Distributed 1. Longest is right 2. 51% node think it is right
31. But, we didn’t discuss the algorithm in this talk
32. And last
33. How the Blockchain save data?
34. Merkle Tree
36. Very useful to update and verify data
37. But read will spend more time
38. Should I use pure ruby gem to operate blockchain?
39. It is hard to implement the same API in pure Ruby
40. Use the existed API to operate Blockchain.
41. But, you can implement blockchain in Ruby
42. Example Ethereum’s IPC Use Ruby to operate Ethereum
43. IPC =~ UnixSocket
45. How to get IPC and comminuted with it?
46. IPC 1. Ethereum Wallet 2. brew install geth 3. Compile from source code
47. “geth —light —testnet”
48. But I suggest using Ethereum Wallet
49. Because you can find IPC file very easy
50. But how to use UnixSocket to operate Ethereum?
51. JSON-RPC 2.0
54. And it always ends with a linefeed (\n)
57. Now, we can interact with Ethereum in Ruby
58. But the result has many hash value
59. What are the meaning and real data?
60. Ethereum Data 1. Call another API to get transaction value 2. Read from “data” depend on ABI
61. If we just want to know transaction value
62. It always contains in API response
63. So, we talk about smart contract event
65. But we got the data in hex
67. It always returns the 32byte hex string for us
68. So, we need ABI to help us know the data type
70. Demo - Subscribe event and get data
71. Now, we know what can we do on the Ethereum
72. And last, is there has any useful resource?
73. Ruby Reference 1. digest-sha3 2. rlp 3. ruby-ethereum 4. Naivechain.rb
74. Conclusion
75. Build a blockchain in Ruby can help us learn it
76. And didn’t try to write a client in pure ruby
77. THANKS