Solidity
Browse all Solidity articles.
11 min read
ERC-7201 Storage Namespaces Explained
ERC-7201 Storage Namespaces Explained ERC-7201 (formerly EIP-7201) is a standard for grouping storage variables together by a common identifier called a namespace, and also to document the group of...
11 min read
Fixed Point Arithmetic in Solidity (Using Solady, Solmate, and ABDK as Examples)
Fixed Point Arithmetic in Solidity (Using Solady, Solmate, and ABDK as Examples) A fixed-point number is an integer that stores only the numerator of a fraction — while the denominator is implied....
21 min read
Understanding ABI encoding for function calls
Understanding ABI encoding for function calls ABI encoding is the data format used for making function calls to smart contracts. It is also how smart contracts encode data when making calls to other...
18 min read
Delegatecall: The Detailed and Animated Guide
Delegatecall: The Detailed and Animated Guide This article explains how delegatecall works in detail. The Ethereum Virtual Machine (EVM) offers four opcodes for making calls between contracts: * and...
46 min read
Smart Contract Security
Smart Contract Security !smart contract security This article serves as a mini course on smart contract security and provides an extensive list of the issues and vulnerabilities that tend to recur in...
53 min read
The RareSkills Book of Solidity Gas Optimization: 80+ Tips
The RareSkills Book of Solidity Gas Optimization: 80+ Tips !solidity gas optimization TABLE OF CONTENTS The RareSkills Book of Gas Optimization Gas optimization tricks do not always work Beware of...
6 min read
Three ways to detect if an address is a smart contract
Three ways to detect if an address is a smart contract This article describes three methods in Solidity for determining if an address is a smart contract: Check if . This is not a recommended method,...
5 min read
Understanding the Function Selector in Solidity
Understanding the Function Selector in Solidity The function selector is a 4-byte id that Solidity uses to identify functions under the hood. The function selector is how a Solidity contract knows...
4 min read
Low Level Call vs High Level Call in Solidity
Low Level Call vs High Level Call in Solidity A contract in Solidity can call other contracts via two methods: through the contract interface, which is considered a high-level call, or by using the...
5 min read
Solidity Signed Integer
Solidity Signed Integer Solidity signed integers enable using negative numbers in a smart contract. This article documents how they are used at the EVM level. Basic familiarity with the EVM and...
12 min read
A comprehensive guide to the ERC 721 standard and related security issues
A comprehensive guide to the ERC 721 standard and related security issues ERC721 (or ERC-721) is the most widely used Ethereum standard for nonfungible tokens. It associates a unique number with an...
3 min read
Solidity Staticcall EIP 214
Solidity Staticcall EIP 214 Staticcall is like a regular Ethereum call except that it reverts if a state change happens. It cannot be used to transfer Ether. Both the EVM opcode, the Yul assembly...