openzeppelin-contracts

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Translated

Secure smart contract library—access control, tokens (ERC20/721/1155/4626/6909), upgradeable contracts, and utilities.

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Sourcehairyf/blockchain-skills

Added on2026-02-25

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SKILL.md Content

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Skill based on OpenZeppelin Contracts (docs as of 2026-02-09), generated from
sources/openzeppelin
.

OpenZeppelin Contracts is a library for secure smart contract development on EVM. Use via inheritance (e.g. ERC20, AccessControl) or

using for

(e.g. ECDSA, Math). Covers access control (Ownable, RBAC, AccessManager, TimelockController), tokens (ERC20, ERC721, ERC1155, ERC4626, ERC6909), upgradeable variants, and utilities (crypto, math, introspection, structures, storage).

Core References

Topic	Description	Reference
Overview	Library usage, inheritance, extending contracts	core-overview
Access Control	Ownable, AccessControl (RBAC), AccessManager, TimelockController	core-access-control
Tokens	Token standards and when to use ERC20/721/1155/4626/6909	core-tokens
ERC20	Fungible tokens, decimals, transfer, supply	core-erc20
ERC721	Non-fungible tokens, URI storage, minting	core-erc721
ERC1155	Multi-token (fungible + NFT), batch ops, safe transfer to contracts	core-erc1155
ERC4626	Tokenized vaults, shares vs assets, inflation attack mitigation	core-erc4626
ERC6909	Multi-asset (no batch/callbacks), granular approvals, extensions	core-erc6909
ERC20 Supply	Creating supply with _mint and _update, fixed and reward patterns	core-erc20-supply

Features

Upgradeable

Topic	Description	Reference
Upgradeable Contracts	contracts-upgradeable, initializers, namespaced storage	features-upgradeable

Governance & Accounts

Topic	Description	Reference
Account Abstraction	ERC-4337 stack: UserOperation, EntryPoint, Bundler, Paymaster	features-account-abstraction
Governor	On-chain governance, ERC20Votes, quorum, timelock, proposal lifecycle	features-governance
Multisig	ERC-7913 signers, threshold and weighted multisig with Account	features-multisig
Smart Accounts	ERC-4337 Account, signers, factory, UserOp, batched execution	features-accounts
EOA Delegation	EIP-7702 delegation to contracts, SignerEIP7702, authorization	features-eoa-delegation

Utilities

Topic	Description	Reference
Utilities	ECDSA, MerkleProof, Math, ERC165, structures, StorageSlot, Multicall	features-utilities

Best Practices

Topic	Description	Reference
Backwards Compatibility	Semantic versioning, storage layout, safe overrides	best-practices-backwards-compatibility
Extending Contracts	Inheritance, overrides, super, security when customizing	best-practices-extending-contracts
EOA Restriction	Why not to restrict to EOAs only; use access control instead	best-practices-eoa-restriction