Interact with a deployed contract

Use a provider for read-only calls and a signer for state-changing transactions. The ABI describes the functions and events your application can use.

Read without a wallet signature

A view function can be called through the public RPC. Replace the example address with the SimpleStorage address you deployed.

read-simple-storage.ts

import { Contract, JsonRpcProvider } from "ethers";

const abi = ["function get() view returns (uint256)"];
const provider = new JsonRpcProvider("https://eth.didlab.org");
const contract = new Contract("0xYOUR_CONTRACT_ADDRESS", abi, provider);

const value = await contract.get();
console.log(value.toString());

Write with the connected wallet

Calling set(42) changes state, so the wallet must sign the transaction and the network must include it in a block.

write-simple-storage.ts

import { BrowserProvider, Contract } from "ethers";

const abi = [
  "function set(uint256 newValue)",
  "event ValueChanged(uint256 value, address indexed changedBy)"
];

const provider = new BrowserProvider(window.ethereum);
await provider.send("eth_requestAccounts", []);
const signer = await provider.getSigner();

const contract = new Contract("0xYOUR_CONTRACT_ADDRESS", abi, signer);
const tx = await contract.set(42);
console.log("submitted", tx.hash);

const receipt = await tx.wait();
console.log("confirmed in block", receipt?.blockNumber);

Expected evidence

Keep the transaction hash, confirmed block number, contract address, and resulting event/receipt.

Validation profile

Network

DIDLab Blockchain

Chain ID

252501

Client

Hyperledger Besu

Consensus

QBFT

Native asset

TRUST

Platform token

TT (ERC-20)

Solidity examples

0.8.24

Last validated

August 2026

Go deeper in DIDLab Labs

Public documentation explains the workflow and expected result. Authenticated DIDLab Labs adds managed workspaces, deeper exercises, checkpoints, evidence capture, and instructor assessment.

Open DIDLab Labs