Guides

Contracts Wizard is an interface to interactively build a contract out of components from OpenZeppelin Contracts. Select the kind of contract that you want (current support for ERC20 and ERC721), set…

The DeFi space, and recently the NFT space, have continued to see a variety of exploits and even insider attacks resulting in vault losses, unexpected liquidations, and fraudulent token mints.…

Clones (minimal proxies) as described in ERC1167, are very small, and cheap to deploy, smart-contracts that delegate all incoming calls to an implementation (template) contract containing the…

Gasless MetaTransactions with OpenZeppelin Defender. The workshop covers the following: Intro to MetaTransactions; How to accept meta-txs in a contract using OpenZeppelin Contracts; Relay meta-txs…

A flash-mintable asset-backed token is an ERC20-compliant token that is: Asset-backed and Flash-mintable.

A high-severity vulnerability in the Argent wallet would have allowed attackers to take over wallets with no guardians. User action would have been needed to prevent the takeover attack in less than…

Learn about lending, collateral, loan to collateral ratio, protocol tokens, price oracles, liquidation, risks and more!

In this deep dive into low-level EVM code, you will learn how to code a Minimal Proxy (EIP 1167) from scratch, no Solidity involved. Finally, we see how to easily deploy the proxy using…

How to protect your contracts against reentrancy after Ethereum’s Istanbul hard fork.

The Gas Station Network, or GSN for short, is a decentralized solution for solving user onboarding to Ethereum applications. It allows you as an app developer to pay for your users' transactions...