Discover How to Remove Data from Contracts with DocHub

Aug 6th, 2022
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How to how to remove contracts

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in solidity theres a function called self-destruct where when you call it you can delete the contract from the blockchain also when you call self-destruct other than deleting the contract youll also be able to send ether to any address even if that address is a contract then it doesnt have a fallback function so to show you this im going to first show you how to use self disjunct ill name the contract tail and the function to execute self-destruct ill call it autokill this function will be external and well call self-destruct now self-destruct takes in a single input an address to force all of the ether that is stored in this contract too for example for inside here if we say message dot sender and lets also say that there is one ether locked in this contract then when we call the function kill it will execute self-destruct this would delete this contract from the blockchain and since we said that this contract stores one ether its gonna send that one ether to message.sender

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Destruction of smart contracts. The smart contract published to the blockchain cannot be destroyed from outside, thus if the contract needs to be destroyed, the logic needs to be written during development. When the contract is destroyed, the storage area of the old contract is destroyed as well.
The only way code is removed from the blockchain is when a contract owner calls the self destruct operation. The remaining Ether stored in that contract are sent to a designated target and then the storage and code is removed from the state of the block chain.
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];
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.
So then how can smart contracts be upgradeable? The short answer is that smart contracts are not themselves able to changetheyre permanent and immutable once deployed to a blockchain.
**** 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. If a smart contract has an associated hbar balance, you will need to transfer the balance to another Hedera account.
The smart contract technology Any smart contract is a simple program defined by lines of code working and being executed directly on the blockchain. Since the smart contract codes are permanently available on the blockchain, the paradigm of privacy has changed.
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.
The only way code is removed from the blockchain is when a contract owner calls the self destruct operation. The remaining Ether stored in that contract are sent to a designated target and then the storage and code is removed from the state of the block chain.
Smart contracts are first compiled and converted into bytecode when the contract is deployed. This bytecode is then stored on the blockchain, and an address is assigned to it.

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