Processing Basic Transaction Scripts with Ethereum
In this article, we will look at a simple example of processing a basic transaction (tx) script with Ethereum. We will also show you how to retrieve the recipient address from the raw transaction.
Introduction
Ethereum is a decentralized platform that allows developers to create smart contracts and decentralized applications (dApps). Transaction scripts are used to perform specific logic on the blockchain, such as validating transactions or performing calculations on data. In this example, we will focus on a simple tx script that verifies the identity of the sender and retrieves the recipient address.
Example of a Basic tx Script
Here is an example of a basic tx script in Solidity (the programming language used to develop Ethereum):
pragma solidity ^0.8.0;
contract BasicTxScript {
function verifySender(address sender) public view returns (bool) {
// Check if the sender's signature matches our expected public key
require(msg.sender == keccak256("expected_public_key"), "Invalid sender");
return true;
}
function getRecipientAddress(address receiver) public view returns (address) {
// Check if the recipient's address is valid by checking if the hash is empty or invalid
require(bytes(recipient).length > 0 && bytes(recipient).hash == keccak256("expected_hash"), "Invalid recipient");
return receiver;
}
}
Example use case
To process this tx script, we need to define a contract that implements the BasicTxScript interface. We will also create two functions: verifySender and getRecipientAddress, which will be called by the contract after receiving the transaction.
pragma solidity ^0.8.0;
contract TransactionProcessor {
BasicTxScript basicTxScript;
address public receiver;
function setRecipient(address _recipient) public {
receiver = _recipient;
}
function verifySender(address sender) public view returns (bool) {
return basicTxScript.verifySender(sender);
}
function getRecipientAddress() public view returns (address) {
return basicTxScript.getRecipientAddress(recipient);
}
}
Transaction Processing
Now that we have a contract implementing the BasicTxScript interface, let’s create a new transaction and call functions to verify the sender and get the recipient address.
pragma solidity ^0.8.0;
contract Example {
TransactionProcessor processor;
uint256 public txHash;
function createTransaction() public {
// Set the recipient address as a variable
uint256 _recipient = 0x123456789012345678901234567890abcde;
// Create a new transaction and set its hash to a random value
processor.setRecipient(_recipient);
txHash = block.timestamp * 1000000; // Set the transaction timestamp to a high value
}
function verifySender(address sender) public view returns (bool) {
return processor.verifySender(sender);
}
}
Running the example
To run this example, we need to implement the TransactionProcessor contract and create a new transaction using the Example contract. We will also update the createTransaction() function to set the recipient address.
“`solidity
pragma solidity ^0.8.0;
contract Example {
TransactionProcessor processor;
uint256 public txHash;
mapping(address => string) public senderAddressToPublicKey;
function createTransaction() public {
// Set recipient address as variable
uint256 _recipient = 0x123456789012345678901234567890abcde;
// Create a new transaction and set its hash to a random value
processor.