Ink! Developer Workshop - Web3bridge Edition

Objectives

• Understand how to do cross-contract calls in ink!
• Differences between calling smart contracts on same (vs different) chains
• Understand how Contract References, CallBuilder and CreateBuilder work and when they should be used
• Explain how XCM works within smart contracts
• Decoding the content of the ink! Metadata file
• Recap on Selectors
• Building a ERC20 meme coin on ink! using the discussed features

Cross Contract Calls

Allows calling the messages (and constructors) of other on-chain smart contracts.

How?

1. Contract References (also called ContractRef)
2. Builders
   1. CreateBuilder
   2. CallBuilder

Contract References

• The contract to call must be imported.