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

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

Error: “Invalid sender” when signingTransaction in 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 several reasons:

• Invalid sender: The signTransaction method expects a valid Ethereum address as its sender. However, if you are trying to send funds from a private key to an external wallet on the BSC testnet, this may not work.

• Invalid contract ABI: If the ABI (Application Binary Interface) of the contract is invalid or incomplete, the signTransaction method may throw an error.

• No Web3 provider: Metamask requires a Web3 provider to work 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 ABI contract:

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

const c = contract;
const rewardsCalculatedTx = 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 !== rewardsCalculatedTx.sender) {
console.error(Invalid sender: ${senderAddress} != ${rewardsCalculatedTx.sender});
return;
}

• Make sure your Web3 provider is installed:

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

• Text with a valid sender:

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

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

const c = contract;
const rewardsCalculatedTx = 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 contract address from ABI
const contractAddress = ABI[0].constant;
try {
// Sign transaction using contract address and private key
const signedTx = rewardsCalculatedTx.sign(privateKey);
console.log(Signed transaction: ${signedTx});
} catch (error) {
console.error(Transaction signing error: ${error.message});
}

I hope this helps you resolve the “Invalid Sender” error when using Metamask to sign transactions on the BSC testnet. If you have any further questions or issues, feel free to ask!

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