Solidity

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…

A fixed-point number is an integer that stores only the numerator of a fraction — while the denominator is implied.

ABI encoding is the data format used for making function calls to smart contracts.

This article explains how delegatecall works in detail. The Ethereum Virtual Machine (EVM) offers four opcodes for making calls between contracts.

80+ ways to cut gas costs in Solidity, from avoiding zero-to-one storage writes and packing variables to calldata and assembly tricks, plus tricks to avoid.

A reference to the vulnerabilities that keep recurring in Solidity contracts, from reentrancy and access control to oracle manipulation and flash loans.

This article describes three methods in Solidity for determining if an address is a smart contract. We discuss each method in this tutorial.

Solidity signed integers enable using negative numbers in a smart contract. This article documents how they are used at the EVM level.

The function selector is the first 4 bytes of the keccak256 hash of a function signature. See how Solidity computes it, how to get it, and collision odds.

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…

ERC721 (or ERC-721) is the most widely used Ethereum standard for nonfungible tokens.

Staticcall is like a regular Ethereum call except that it reverts if a state change happens. It cannot be used to transfer Ether.