How to Delete Data from Contracts

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How to How to Delete Data from Contracts

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The solidity function self-destruct allows for the deletion of a contract from the blockchain and the transfer of ether to an address, even if it is a contract without a fallback function. To demonstrate, a contract named "tail" with an external function named "autokill" is used. The autokill function uses self-destruct with an input parameter of an address to transfer any stored ether to that address. When executed, the contract is deleted, and the stored ether is sent to the specified address.

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How do you self destruct a smart contract?

With the CREATE2 op-code you can instruct the EVM to place your Smart Contract on a specific address. Then you could call selfdestruct(), thus remove the source code. Then re-deploy a different Smart Contract to the same address.

Why do smart contracts self-destruct?

On the one hand, using selfdestruct function enables developers to remove smart contracts (SC) from Ethereum and transfers Ethers when emergency situations happen, e.g. being attacked. On the other hand, this function can increase the complexity for the development and open an attack vector for attackers.

Can a smart contract be deleted?

Once a smart contract is marked deleted, you will not be able to modify any of the contracts properties. **** If a smart contract did not have an admin key defined, you cannot delete the smart contract. You can verify the smart contract was deleted by submitting a smart contract info query to the network.

How do I delete data from my smart contract?

This is a stateful system, and where we change the state of the smart contact, and which will require the payment of some case to the miners. But how do we delete data? Once a match is found, we can then delete the data element with [here]: delete myArray[j];

How does self-destruct work in solidity?

Selfdestruct works by erasing the contract bytecode from the chain, sending any liquidity to a specified address, and then, refunding a portion of the gas fees to developers. A contract consists of two components: state and functions. These components define contract behavior and callable functions.

How do you self-destruct a contract Ethereum?

The selfdestruct function causes the remaining Eth on the contract to be sent to a specific address. This can be done by creating a malicious contract to target the EtherGame contract with the selfdestruct function. Now we can deposit multiple Eth into the EtherGame contract and bypass the EtherGame.

Can smart contracts be removed?

Crucially, a smart contracts code cannot be changed once it has been deployed. There are some ways around this, including proxy smart contracts, but once a piece of smart contract code has been added to the blockchain theres no practical way to stop or delete it. The code runs autonomously, forever.

How do you remove a clause from a contract?

Describe the change in clear, concise words, for example: In Item 4 of the Original Contract the word $60,000 shall be deleted and replaced with the word $65,000. Alternatively when writing an amendment, copy the clause from the original contract and show any changes using bold text and strikethroughs.

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