Upgradation in smart contract is very important part, to enhance functionality or improve security. But updating a smart contract is different from tradition method. e.g. storage.sol a seperate storage contract to handle storage. and its library. Contract version 1: use the library of storage contract to access the storage contract. Backend contract version 2 Here… Continue reading Eternal Upgradeable Pattern in Solidity
Here is the first pattern to upgrade a smart contract via a middle registry contract. Which returns the new version contract. Below is the structure of Registry Upgradeable Smart Contract Pattern. Onwer.sol registry.sol this contract act as a middle man to get the address of upgraded of latest backend contract. BackendContract.sol this is the main… Continue reading Registry Upgradeable Pattern
Here is the code example how can we destruct a contract. For destruction we have to set the payable address in selfdestruct method where all ethers of contract can be transferred. After destruct a contract all state variables become null, 0 or false, also we can’t update any state variable. e.g.
In this pattern we can define the owner of a contract, which restrict or control the protected methods, also can transfer his ownership to another.
Delay in withdraw can save smart contract from malicious activity. Here is the example how you can apply a delay in smart contract.
In the live contract there are many chances we find an type of error and we have to stop smart contract to handle malicious activity. here is the sample of Circuit Break Pattern.
During developing a smart contract sometime we need to manage the different stages and execute and restrict method according to that state/stage of the smart contract.
Authentication is very important in any project to control and give limited access to users for this purpose, in solidity we get this functionality with this pattern.
Here we apply cost based restriction, in which sender can’t able to send ethers less than cost defined my contract Owner.
Sometime we need to apply time base restrictions for special offer or ICO. Below, is the example for timebase restriction.