OpenZeppelin

Smart contract security company known for its audited open source Solidity library.

OpenZeppelin builds the widely used OpenZeppelin Contracts library, offers security audits for blockchain projects and runs tooling and research around smart contract security. It also publishes audit reports and advisories that are worth studying if you want to hunt bugs in Web3 code.

Why it's useful

Read its public audit reports to learn how Solidity bugs are found and written up.

Category: Bug Bounty
Pricing: Free (libraries and reports); audits are paid
Tags: web3, smart contracts, audit, solidity
Link: www.openzeppelin.com