Building a Secure Interchain Messaging dApp: A technical Deep Dive

Building a Secure Interchain Messaging dApp: A technical Deep Dive

Transcript

1. Building a Secure Interchain Messaging dApp November, 2023 - Lagos, Nigeria
2. Idris Olubisi Developer Advocate,Axelar @olanetsoft
3. By a show of hands, how many of you have directly interacted with a blockchain application before?
4. Have you heard the word “Interchain” or “Cross-chain”?
5. The concept of blockchain Lagos, Nigeria
6. The concept of blockchain Blockchain creates a safe and open way of recording transactions with a shared and unchangeable digital record, eliminating the need for middlemen.
7. Decentralized Applications • Your backend runs on 1000s of computers • Instead of paying Amazon, you pay gas to validators • Immutability • Trade-offs between speed, cost, privacy, and more
8. A brief history of blockchain Lagos, Nigeria
9. The Beginning, 2009-2017 1 2 3 A brief history of blockchain
10. A brief history of blockchain New platforms, 2017-2022 2 1 3
11. A brief history of blockchain Omnichain, 2023- the future 3 1 2
12. How do you take advantage of the new world? • What if you didn’t care which chain you were on? • What if you took advantage of chain differences? • What if you could be where your users are?
14. Axelar is 1. Security & decentralization focused 2. Integrated into 50+ chains 3. Simple to use
15. Axelar Tech Stack
16. Send Tokens 1. Deposit Addresses 2. sendToken() 3. Interchain Tokens
17. A deposit address is a temporary special address created and monitored by Axelar's Relayer Services on behalf of the requester. const sdk = new AxelarAssetTransfer({ environment: "testnet" }); const depositAddress = await sdk.getDepositAddress({ fromChain, // source chain name toChain, // destination chain name destinationAddress, // destination chain address Asset // asset to transfer }); Deposit Addresses
18. sendToken is a function in Axelar's gateway EVM contract that facilitates token transfers between EVM and Cosmos chains. sendToken( "avalanche", // destination chain name "0xF16DfB26e1FEc993E085092563ECFAEaDa7eD7fD", // destination address "USDC", // asset symbol 100000000 // amount (in atomic units) ) sendToken()
19. Interchain Tokens Interchain Tokens allow you to send tokens cross-chain, build your own asset bridges, build asset transfers into your interchain dApp and many more. How is this different? - Create a standardized ERC-20 token on multiple chains via the Interchain Portal - Build a custom token on every chain with built-in methods for sending - Upgrade an existing token by deploying a wrapper on every chain - Make Interchain Tokens executable alongside GMP messages for enhanced functionality.
21. Send Messages 1. callContract() 2. callContractWithToken()
22. Axelar's GMP enables a developer building on one chain to call any function on any other connected chain. callContract() // Src Chain function callContract( string memory destinationChain, string memory contractAddress, bytes memory payload ) external; // Dest Chain function _execute( string memory sourceChain, string memory sourceAddress, bytes calldata payload ) internal virtual {}
23. Axelar's GMP enables a developer building on one chain to call any function on any other connected chain. callContractWithToken() // Src Chain function callContractWithToken( string memory destinationChain, string memory contractAddress, bytes memory payload, string memory symbol, uint256 amount ) external; // Dest Chain function _executeWithToken( string memory sourceChain, string memory sourceAddress, bytes calldata payload, string memory tokenSymbol, uint256 amount ) internal virtual {}
24. Dapp Dapp Source Chain (eg Ethereum) Destination Chain (eg Polygon) Gateway 1. callContract() 4. _execute() Gateway 2. Emit event 3. approveContractCall() Axelar Network Validators & Consensus
25. Instead of moving assets to compute, move compute to where assets are
26. Real-World Applications Lagos, Nigeria
29. Demo 1. Clone a simple Next.js UI 2. Write a smart contract 3. Deploy the smart contract 4. Wire/connect the smart contract to the frontend 5. Test the application bit.ly/interchain-messaging-dap p-workshop
30. Axelar Examples github.com/axelarnetwork/axelar-examples
31. Foundry Axelar GMP Examples github.com/axelarnetwork/foundry-axelar-gmp- example
32. What Next ??? It’s Easy to Build Interchain-Native dApps For support, visit #developers on Axelar's Discord
33. Idris Olubisi Developer Advocate,Axelar @olanetsoft bit.ly/olanetsoft-survey