How to sign a transaction for a smart contract call using Ethers?

Question

I'm looking for a complete example of a javascript/typescript based code for signing a transaction for a smart contract function call (that changes the contract state) and also the broadcast of the transaction, using Ethers.

the internet is blowing out from the amount of such examples — Nulik, Jul 18 '21 at 17:29
@SeeingProrok I need it using Ethers (just updated the question). Also notice I seed to sign a smart contract call. — forhas, Jul 19 '21 at 07:44

score 1 · Accepted Answer · answered Jul 19 '21 at 09:10

Find the below example,

const release = async () => {
    try {
        //Set price to 1 Gwei
        let gasPriceHex = ethers.utils.hexlify(8000000000);
        //Set max gas limit to 4M
        var gasLimitHex = ethers.utils.hexlify(4000000);
        // Raw Transaction
        var rawTx = {
            gasLimit: gasLimitHex,
            gasPrice: gasPriceHex,
        };
        // https://docs.ethers.io/v5/api/signer/#Signer-populateTransaction
        let unsignedTx = await contactSendInstance.populateTransaction.release(contractAddress, rawTx)
        let response = await wallet.sendTransaction(unsignedTx);
        await response.wait();
        console.log('response', response);
} catch (e) {
    console.log('In Catch Block: Error : ', e.message);
}

};

Refer : https://docs.ethers.io/v5/

What is the signature of the smart contract function you are calling here? — forhas, Jul 19 '21 at 09:22
The above method calls "release()" function in smart contract — Keerthana Ramalingam, Jul 21 '21 at 05:20

How to sign a transaction for a smart contract call using Ethers?

1 Answers1