Creating dense Subgraphs is one of the most important aspects of indexing on-chain information. In this workshop we show you how with OpenZeppelin Subgraphs

PoolTogether is a lossless lottery built with smart contracts using Defender to automate the award cycle process and monitor the LINK balance. 

Chainlink’s Keeper Network is a secure way to outsource contract operations to a decentralized network of professional DevOps for critical functions

Upgradeable contracts allow us to alter a smart contract to fix a bug, add additional features, or simply to change the rules enforced by it. Smart contract upgrades can be managed using OpenZeppelin Defender.

Upgradeable contracts allow us to alter a smart contract to fix a bug, add additional features, or simply to change the rules enforced by it. Smart contract upgrades can be managed using OpenZeppelin Defender.

Upgradeable contracts allow us to alter a smart contract to fix a bug, add additional features, or simply to change the rules enforced by it. Smart contract upgrades can be managed using OpenZeppelin Defender.

Upgradeable contracts allow us to alter a smart contract to fix a bug, add additional features, or simply to change the rules enforced by it. Smart contract upgrades can be managed using OpenZeppelin Defender.

Access control—that is, “who is allowed to do this thing”—is incredibly important in the world of smart contracts. The access control of your contract may govern who can mint tokens, vote on proposals, freeze transfers, and many other things. It is therefore critical to understand how you implement it, lest someone else steals your whole system.

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. OpenZeppelin Defender can help teams detect these types of attacks and abnormal behavior and automatically respond to quickly mitigate the attack.

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 functionality.