Developers

Cross-Chain Messaging

Tutorials

Cross-Chain Counter

Build a cross-chain counter

This is an example app of cross-chain counter using Zeta Connector.

Set up your environment

git clone https://github.com/zeta-chain/template

Install the dependencies:

yarn add --dev @openzeppelin/contracts

Create a new contract

contracts/CrossChainCounter.sol

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Create a deployment task

tasks/deploy.ts

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hardhat.config.ts

import "./tasks/deploy.ts";

Create a task to get the counter value

tasks/counter_show.ts

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hardhat.config.ts

import "./tasks/counter_show.ts";

Create a task to increment the counter value

tasks/counter_increment.ts

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hardhat.config.ts

import "./tasks/counter_increment.ts";

Deploy the contract

Clear the cache and artifacts, then compile the contract:

npx hardhat compile --force

npx hardhat deploy --networks mumbai_testnet,bsc_testnet

🚀 Successfully deployed contract on mumbai_testnet.
📜 Contract address: 0xb10bD8b51B433079e960ec91BEADCDc4434e3E69

🚀 Successfully deployed contract on bsc_testnet.
📜 Contract address: 0x2A5831b69EbBD6941e68A17bAD34184B7c4a7628

🔗 Setting interactors for a contract on mumbai_testnet
✅ Interactor address for 97 (bsc_testnet) is set to 0x2a5831b69ebbd6941e68a17bad34184b7c4a7628

🔗 Setting interactors for a contract on bsc_testnet
✅ Interactor address for 80001 (mumbai_testnet) is set to 0xb10bd8b51b433079e960ec91beadcdc4434e3e69

Increment the counter value

Show initial counter value on both chains

npx hardhat counter:show --contract 0xb10bD8b51B433079e960ec91BEADCDc4434e3E69 --network mumbai_testnet

🔑 Using account: 0x2cD3D070aE1BD365909dD859d29F387AA96911e1

🔢 The counter for 0x2cD3D070aE1BD365909dD859d29F387AA96911e1 is: 0

npx hardhat counter:show --contract 0x2A5831b69EbBD6941e68A17bAD34184B7c4a7628 --network bsc_testnet

🔑 Using account: 0x2cD3D070aE1BD365909dD859d29F387AA96911e1

🔢 The counter for 0x2cD3D070aE1BD365909dD859d29F387AA96911e1 is: 1

Increment the counter value

npx hardhat counter:increment --contract 0xb10bD8b51B433079e960ec91BEADCDc4434e3E69 --amount 100 --destination 97 --network mumbai_testnet

🔑 Using account: 0x2cD3D070aE1BD365909dD859d29F387AA96911e1

✅ "crossChainCount" transaction has been broadcasted to mumbai_testnet
📝 Transaction hash: 0xf569119f06ddac13093ba97c2dea9932036ee7ad51ac8d3ac9379dd22c48dd94

Source Code

You can find the source code for the example in this tutorial here:

https://github.com/zeta-chain/example-contracts/blob/feat/import-toolkit/messaging/counter