Developing Smart Contracts from Scratch with LINE Blockchain

Shiki Takahashi (LINE / Blockchain Engineering Team / Software Engineer)

https://tech-verse.me/ja/sessions/76
https://tech-verse.me/en/sessions/76
https://tech-verse.me/ko/sessions/76

Transcript

2. Agenda - Road to smart contract - How to develop smart contract - Let’s start first contract - Summary
3. Road to smart contract
4. Road to smart contract
5. Road to smart contract Gas fee Wallet Crypto currency What problems do you face when developing services on the blockchain?
6. Road to smart contract Gas fee Wallet Crypto currency You can use LINE Blockchain to reach 1 million* wallet with your services *The number of wallets includes wallets that received NFT grants through the NFT Free Distribution Campaign and LINK Rewards.
7. Road to smart contract Platform for easy development of services to reach 1 million users
8. Can Mint Burn Transfer...etc Basic operations related to tokens Cannot Escrow Auction...etc Application-specific business logic for that token Road to smart contract What LINE Blockchain Developers(LBD) can and cannot do
9. Road to smart contract We will be release a smart contract feature to implement business logic on-chain. Smart contract VM Deploy Call Blockchain Developer Development Code Users Related session ”How to Find Bugs in CosmWasm Smart Contract?”
10. Road to smart contract Only LINE Blockchain Developers(LBD) Use Smart contract LINE Blockchain Mainnet LBD (Token) Application (Business logic) Users Business logic Token Users
11. Let’s start to develop NFT contract How to develop smart contract
12. Generate template How to develop smart contract cargo generate --git https://github.com/CosmWasm/cw-template.git --name <project name> init project
13. Define message How to develop smart contract First, let’s start from msg.rs
14. Define message How to develop smart contract Instantiate Query Execute Initialize smart contract Get data from smart contract Run contract with smart contract msg.rs
15. Define message How to develop smart contract msg.rs
16. Define message How to develop smart contract msg.rs
17. Define message How to develop smart contract msg.rs
18. Define state How to develop smart contract
19. Define state How to develop smart contract Define the information you want to store in the smart contract in state.rs state.rs
20. Define state How to develop smart contract https://github.com/line/cosmwasm/tree/main/packages/storage state.rs
21. Implement contract logic How to develop smart contract Now Let’s write the code that handles the business logic!
22. Implement instantiate How to develop smart contract contract.rs
23. Implement instantiate How to develop smart contract contract.rs
24. Implement instantiate How to develop smart contract contract.rs
25. Implement instantiate How to develop smart contract https://github.com/CosmWasm/cosmwasm/blob/main/ packages/std/src/results/response.rs contract.rs
26. Implement instantiate How to develop smart contract contract.rs
27. Implement instantiate How to develop smart contract contract.rs
28. Implement execute How to develop smart contract contract.rs
29. Implement execute How to develop smart contract contract.rs
30. Implement query How to develop smart contract contract.rs
31. Implement query How to develop smart contract contract.rs
32. How to develop smart contract How to call other smart contract
33. Submessages / Reply How to develop smart contract Retrieve and use the results of the processing of the contract to which you are calling
34. Submessages / Reply How to develop smart contract
35. Submessages / Reply How to develop smart contract
36. Submessages / Reply How to develop smart contract Get address Set and save
37. How to develop smart contract How to use ”Dynamic Link” to call other smart contract Related session ” Dynamic Link: Smart Contract Interaction Method Developed by LINE”
38. Dynamic Link How to develop smart contract Callee side contract Business logic (Caller) Token (Callee)
39. Dynamic Link How to develop smart contract Business logic (Caller) Token (Callee) Caller side contract
40. Dynamic Link How to develop smart contract Business logic (Caller) Token (Callee) Caller side contract
41. Let’s start first contract
42. Let’s start first contract flow Compile Store Instantiate Execute Query Rust Code WASM CODE ID CONTRACT ADDRESS
43. Let’s start first contract flow Compile Store Instantiate Execute Query Rust Code WASM CODE ID CONTRACT ADDRESS
44. Let’s start first contract You want to create an NFT auction service Seller Bidder Auction NFT ① Mint ② Listing ③ Bid ④ Withdraw https://github.com/shiki-tak/line-blockchain-auction
45. Let’s start first contract flow
46. Summary
47. Summary › Add smart contract functionality to LINE Blockchain to allow business logic to be implemented on-chain. › Our smart contract can be developed without using any unique technology. › Contract is implemented in a message-driven format. › In the case of call another contract, it will be possible to implement it like any other platform contract.
48. Summary › Add smart contract functionality to LINE Blockchain to allow business logic to be implemented on-chain. › Our smart contract can be developed without using any unique technology. › Contract is implemented in a message-driven format. › In the case of call another contract, it will be possible to implement it like any other platform contract.
49. Summary › Add smart contract functionality to LINE Blockchain to allow business logic to be implemented on-chain. › Our smart contract can be developed without using any unique technology. › Contract is implemented in a message-driven format. › In the case of call another contract, it will be possible to implement it like any other platform contract.