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How to create an upgradeable smart contract using ZeppelinOS — example of fixing smart contract vulnerable to underflow/overflow attacks

Post originally written by @paulinablaszk on medium (Apr 23, 2019) In this tutorial we will use ZeppelinOS to fix smart contract vulnerable to underflow/overflow attacks. Firstly we will prepare our environment and create the upgradeable smart contract with some bug and test it. Then we will update the code, upgrade the smart contract and finally, we will check if it is safe. [image] Upgradeability in smart contracts In principle smart contracts are immutable. Once deployed to the network…