OpenZeppelin Contracts Skill Expert usage of OpenZeppelin Contracts, the standard library for secure smart contract development. Capabilities - Access Control : Ownable, AccessControl, Governor patterns - Upgradeable Contracts : UUPS and Transparent Proxy plugins - Token Standards : ERC-20, ERC-721, ERC-1155 implementations - Security Utilities : ReentrancyGuard, Pausable, SafeERC20 - Governance : Governor and TimelockController - Metatransactions : ERC-2771 support - Cryptographic Utilities : ECDSA, MerkleProof, EIP712 Installation Access Control Ownable AccessControl (Role-Based) AccessCont…