Ethereum: how does Alice know she has the right address?

Understanding Ethereum Address Verification: A Step-by-Step Guide

Ethereum’s decentralized platform relies heavily on secure and private transactions, which involve cryptographic techniques to verify the identity of the sender and ensure that the transaction reaches the intended recipient. One of the critical components in this process is the Ethereum address, a unique string of characters used to identify users and their respective accounts on the network.

In this article, we’ll look at how Alice can be sure that she’s receiving the correct Ethereum address from Bob, ensuring that the transaction is secure, transparent, and tamper-proof.

The Importance of Address Verification

When Bob wants to send some coins (known as “ETH”) to Alice, he needs to tell her where to send them. To do this, Bob needs to provide an Ethereum address, which is a unique 40-character string, often represented as “0x…”. This address serves several purposes:

• Identify Sender: The first 21 characters (0x) identify the sender (Bob) and confirm that they are attempting to send funds.

• Specify Recipient: The next 19 characters (...) specify the recipient of the funds (Alice).

• Verify Transaction Integrity: The last few characters (...) help prevent potential double-spending attacks by ensuring a unique hash of the transaction.

How ​​Bob Sends His Address

In order for Alice to verify that she is receiving the correct address from Bob, she must follow these steps:

• Create an Ethereum Account: Bob creates an Ethereum wallet and sets up his own public and private keys.

• Send Address to Alice: Using a secure communication channel (e.g., email or messaging app), Bob shares his unique Ethereum address with Alice. This is done in a way that ensures the sender’s identity is preserved.

• Use Web3.js or another library: To interact with the Ethereum network, Bob uses an integrated development environment (IDE) such as Truffle Suite or Web3.js to create a JavaScript application.

Here is a step-by-step example using Web3.js:

const web3 = new Web3(new Web3.providers.HttpProvider('
asynchronous function sendTransaction() {
const recipientAddress = '0x...'; // Bob's address
const quantity = 10n; // Amount of ETH to send
try {
const transaction = await web3.eth.sendSignedMessage ({
from: '0x...', // Alice's address (Bob sent this)
to: recipient's address,
value: amount.toString(),
gasPrice: web3.eth.gasPrice
});
console.log(Transaction sent successfully!);
} catch (error) {
console.error(error);
}
}

In this example, the sendSignedMessage function is used to create a signed transaction using Bob’s address. The from',to’, and `value’ parameters specify the recipient’s Ethereum address, the amount of ETH to send, and the gas price, respectively.

Alice verifies the address

To verify that Alice received the correct address from Bob, she can:

• Check the transaction history: In the Ethereum network, transactions are stored in a public ledger called the blockchain. By checking this ledger, Alice can ensure that Bob’s address was successfully verified and linked to her account.

• Check the recipient’s identity: Using Web3.js or another library, Alice can verify that the recipient of the funds is indeed “0x…”, confirming that she is receiving the correct Ethereum address from Bob.

In conclusion, Alice can be sure that she is receiving the correct Ethereum address from Bob by verifying its unique identifier (sender and recipient) through various means, such as the transaction history or Web3.js libraries. This ensures secure, transparent, and tamper-proof transactions on the Ethereum network.

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