Metamask: Error: ‘Invalid Sender’ when I signTransaction in bscTestnet – Web3

I can help you with that article. However, please note that I will provide a general solution and it may not cover all edge cases or specific use cases of the Metamask library.

Error: ‘Invalid Sender’ when signing a transaction on bscTestnet – Web3

The “Invalid Sender” error usually occurs when the signTransaction method is called with an invalid sender. In the context of the Binance Smart Chain (BSC) testnet, this error can be caused by a few reasons:

• Invalid Sender

  

  – The signTransaction method expects a valid Ethereum address as its sender. However, if you try to send funds from your private key to an external wallet on the BSC testnet, it may not work.

• Invalid Contract ABI

  – If the contract’s ABI (Application Binary Interface) is incorrect or incomplete, the signTransaction method may throw an error.

• Missing Web3 Provider: Metamask requires a Web3 provider to function properly. Make sure you have installed and configured the correct Web3 provider for your environment.

Suggested Solution

Here is a step-by-step solution:

• Check the contract ABI:

Make sure the contract ABI is correctly exported from the contract object in Metamask.

const c = contract;
const awardsCalculatedTx = c.methods.RewardsCalculated().call();

• Check the sender address: Double-check the Ethereum address you are trying to send funds to:

const privateKey = "0xEEEEEEEEEEEEEEEEExample";
// Replace with your actual private key
const senderAddress = privateKey.toHex(); // Convert to hexadecimal
if (senderAddress !== awardsCalculatedTx.sender) {
console.error(Invalid sender: ${senderAddress} != ${rewardsCalculatedTx.sender});
return;
}

• Make sure the Web3 provider is installed:

Make sure Metamask has connected to the correct Web3 provider for your environment. You can check this by checking the “Connect” section in the Metamask settings.

• Try with a valid sender:

Try signing the transaction using a valid Ethereum address, such as 0xYourValidAddress or 0xYourInvalidAddress.

Here is an example of how you can modify your code to fix these issues:

const c = contract;
const awardsCalculatedTx = c.methods.RewardsCalculated().call();
if (rewardsCalculatedTx.sender !== privateKey.toHex()) {
console.error(Invalid sender: ${rewardsCalculatedTx.sender} != ${privateKey.toHex()});
return;
}
// Check the contract ABI and sender
const ABI = c.abi;
console.log(ABI: ${JSON.stringify(ABI)});
// Get the contract address from the ABI
const contractAddress = ABI[0].constant;
try {
// Sign the transaction using the contract address and private key
const signedTx = awardsCalculatedTx.sign(privateKey);
console.log(Signed transaction: ${signedTx});
} catch (error) {
console.error(Error signing transaction: ${error.message});
}

Hope this helps you solve the “Invalid sender” error when using Metamask to sign transactions on BSC Testnet. If you have any further questions or problems, feel free to ask!