Ethereum: OP_RETURN data transaction

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OP_RETURN Data Transaction: Understanding the OP_RETURN Function

In recent updates, Ethereum introduced the OP_RETURN data function, which allows users to store and retrieve information about their transactions. One of the key features of OP_RETURN is its ability to return data during a transaction. But how does it work? In this article, we’ll dive into the details of OP_RETURN transactions and tell you what you need to know.

What is an OP_RETURN transaction?

An OP_RETURN transaction is a type of transaction that stores information about a previous transaction in memory, rather than sending the data as part of the current transaction. This allows for more efficient storage and retrieval of transaction data.

How ​​is data returned during a transaction?

When you create an OP_RETURN transaction, you don’t need to create a new txout' value. Instead, you can specify that the transaction returns the stored data using the "returnData" function. This allows users to retrieve their transaction history and other relevant information without having to send additional data as part of the current transaction.

Consider an OP_RETURN transaction that stores a user's balance in the0x…/balances’ table:

contract BalanceStorage {
mapping (address => uint256) balances;
function setBalance(address _user, uint256 _balance) public {
balances [_user] = _balance;
}
function getBalance(address _user) public view return (uint256) {
return balances [_user];
}
}

To use the OP_RETURN function, you can create an “OP_RETURN” transaction as follows:

pragma force ^0.8.0;
contract OP_RETURN {
storage BalanceStorage;
constructor() {
storage.setBalance(address(_msgSender()), 100);
}
function doWork() public {
request(!storage.getBalance(address(_msgSender))), "User not set yet!");
// Use the stored balance data here
}
}

In this example, when the “doWork” function is called, it returns the stored balance data using the “returnData” function.

Key Benefits

The OP_RETURN transaction has several benefits:

• Improved Security: Reduce the amount of data that needs to be transmitted over the network by storing data in memory and sending it back during the transaction.

• Improved Efficiency: Using OP_RETURN transactions can improve overall efficiency by reducing the number of transactions required to achieve a given goal.

Conclusion

The OP_RETURN data function is a powerful tool for storing and retrieving transaction information in Ethereum. Using this function, you can create more efficient and secure transactions that reduce the amount of data sent over the network. Remember to be careful when executing OP_RETURN transactions, as they can affect the security and scalability of the contract.

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