Ethereum for Ruby

RubyKaigi 2022
Mie Center for the Arts, Mie, Japan

Ethereum for Ruby
https://rubykaigi.org/2022/presentations/kurotaky.html#day3

Transcript

1. Ethereum for Ruby Yuta Kurotaki
2. Yuta Kurotaki @kurotaky RubyKaigi Speaker 2018 RailsGirls Coach 4,7~10,12,13th Yokohama.rb, K-Ruby Kagoshima RubyKaigi 01 Organizer Goods Sponsor (SUZURI, GMO Pepabo, Inc.) eth.rb Maintainer
3. Contents • What is Ethereum? • Ethereum Keys and Addresses • Ethereum Signatures • Ethereum Transaction • Interact with Smart Contract
4. What is Ethereum?
5. Ethereum Blockchain • It is the Ethereum Blockchain invented by Vitalik in 2013 • Trustless on the blockchain • It's called a world computer
6. Ethereum Blockchain https://ethereum.org/en/whitepaper/ APPLY(S,TX) -> S'
7. Ethereum Blockchain https://ethereum.org/en/whitepaper/
8. Etherscan https://etherscan.io/
9. eth.rb • Let's take a look into the world of blockchain with eth.rb! • https://github.com/q9f/eth.rb
10. Ethereum Keys and Addresses
11. Blockchain Wallet • When users create a wallet such as MetaMask, an address of 0xabc.... is created. • This address is required on Ethereum https://metamask.io/
12. Eth::Key • The library can create private/public key pairs • This can also show the required address on ethereum
13. Address 0x4cbeFF8966586874362ce4313D8f80cD404838a3
14. Address • Calculate hash value of public key with Keccak256 • Public key = K, last 20bytes of Keccak256(K) • Returns with 0x; 42 characters (40 without 0x)
15. EIP-55 • If the checksum is 8 or higher, the corresponding address letter is uppercase to prevent input errors. • EIP(Ethereum Improvement Proposals)
16. EIP(Ethereum Improvement Proposals) https://eips.ethereum.org/EIPS/eip-55 https://eips.ethereum.org/EIPS/eip-721
17. EIP-55 • Addresses are not case sensitive • Can be veri fi ed if the checksum is used
18. ENS • Ethereum Domain Name Service • kurotaky.eth https://ens.domains/ https://eips.ethereum.org/EIPS/eip-137
19. Ethereum Signatures
20. Ethereum Signatures • ECDSA (Eliptic Curve Digital Signature Algorithm) • This is used for three purposes 1. proof of authorization to make ETH payments or execute smart contracts 2. proof that the signature is non-repudiation 3. proof that no one has modi fi ed the transaction data since it was signed https://ethereum.org/en/developers/docs/transactions/
21. personal_sign •
22. sign
23. sign
24. Signature.verify
25. EIP-155 https://eips.ethereum.org/EIPS/eip-155
26. Chain ID
27. Transaction
28. Transaction https://ethereum.org/en/whitepaper/
29. Go Ethereum(geth) • Of fi cial Go implementation of the Ethereum protocol • geth --dev --http --ipcpath /tmp/geth.ipc https://geth.ethereum.org/
30. geth
31. Send ETH to another address • Geth (use http server) • use Eth::Client.create
32. transfer_and_wait • 0.000000000000000001 = 1Wei • 0.000000000000000001 * 99000000000000000000 = 99ETH
33. Eth::Unit
34. Interact with Smart Contract
35. Smart Contract • Can automatically execute contracts • Can execute programs on the blockchain
36. Use Cases • DeFi (Decentralized Finance) • Identity (sign in with an ethereum account) • Cryptoeconomics • Stickers/badges • etc.
37. Solidity https://docs.soliditylang.org/en/v0.8.16/introduction-to-smart-contracts.html#simple-smart-contract
38. Solidity Compiler dummy.sol Solidity Compiler (solc) byte code 6080604052..... EVM (Ethereum Virtual Machine) ABI (Application Binary Interface) EVM opcode PUSH1 0x80 PUSH1 0x40 MSTORE
39. Eth::Contract.from_ fi le • Conversion from sol fi les to Ruby objects
40. dummy.sol
41. ABI & bin
42. Deployment of Smart Contracts • Deployment of Smart Contracts • call() and transact_and_wait()
43. Sample App 1 Sign-In with Ethereum https://github.com/q9f/ethereum-on-rails
45. User • username • eth_address • eth_nonce
46. Sample App 2 Non-Fungible Token App https://gihyo.jp/magazine/wdpress/archive/2022/vol130 https://github.com/kurotaky/sample-rails-dapp
48. Let's try it! • This is a Rails application for creating Non Fungible Tokens • Please try it out !
49. Conclusion
50. Conclusion • Ethereum Blockchain Overview • How Ethereum Addresses Work and EIP • Overview of ethereum signatures • About executing smart contracts using eth.rb
51. Future of eth.rb • Language diversity is important so that Ruby can also connect with the Ethereum world! • More examples of creating DApps with Ruby and Rails • Make it easy to connect to existing Rails applications
52. Acknowledgements • @ethmarek • He brought me into the world of Ethereum.rb • @q9f • He promotes and maintains the eth.rb project with us • GMO Pepabo Web3 Development Team • RubyKaigi staff, organizers, committers and attendees
53. Thank You! @kurotaky