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

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

Error: ‘Invalid Sender’ when signing Transaction 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 a few reasons:

• Invalid Sender: The signTransaction method expects a valid Ethereum address as the 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 ABI (Application Binary Interface) of the contract 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 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 = "0xEEEEEEEEEEEEEEEEEEEEEXemplu";
// Replace with the actual private key
const senderAddress = privateKey.toHex(); // Convert to hexadecimal
if (senderAddress !== rewardsCalculatedTx.sender) {
console.error(Invalid sender: ${senderAddress} != ${rewardsCalculatedTx.sender});
return;
}

• Make sure the Web3 provider is installed

  :

Make sure that Metamask has connected to the correct Web3 provider for your environment. You can verify this by looking at the “Connection” section of your Metamask settings.

• Test with a valid sender:

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

Here’s 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;
}
// Verify ABI contract and sender
const ABI = c.abi;
console.log(CE: ${JSON.stringify(CE)});
// Get contract address from ABI
const contractAddress = ABI[0].constant;
try {
// Sign the transaction using the contract address and private key
const signedTx = rewardsCalculatedTx.sign(privateKey);
console.log(Signed transaction: ${signedTx});
} catch ( error ) {
console.error(Error signing transaction: ${error.message});
}

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

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