In this article lets see how we can calculate the deployment address of our contract on the EVM blockchain before deploying. Here we make use of CREATE2 opcode of EVM which is similar to CREATE opcode. Let us deploy “TestContract” and match the address of deployment with our precomputed address…

We have created and deployed the NFT smart contract on our local chain in part-1 here. In this part, let us interact with that smart contract using web3js and Metamask. Part-2 Interacting with the deployed smart contract During our deployment in Part-1, the deployed address of the smart contract can be seen in the truffle terminal along…

In this article lets create NFT using ERC1155 standard and lets also display them using react. ERC1155 vs ERC721 As we know ERC721 is the standard implementation for NFTs, ERC1155 is another standard which can handle both ERC721 and ERC20 objects i.e. both NFTs and Tokens. ERC1155 shines in game implementations where NFTs…

Let's look at the Transaction Order dependence(TOD) issue… Before that, let us dive into some basics. As we all know Ethereum(or any blockchain) is a transaction-based distributed state machine with a shared state. Each transaction changes the state of the machine. A number of transactions are grouped/bundled together (and shared…

Reentrancy became infamous during 2016 DAO hack when millions of dollars worth of crypto was stolen. Read on to see how it is still relevant. What is Re-entrancy? In simple terms re-entrancy means, the call to an external, untrusted contract(“called” contract) results in the program execution re-entering the “calling” contract which was not…

Solidity contracts can call other contracts (execute their code just by knowing their deployed address on the chain)and even can create and deploy contracts. call(), callcode(), delegatecall(), staticcall(), are some of the functions used to call external code/contract. …

In blockchain, deployed code is immutable. …