# Audits

| Date          | Version | Commit                                                                           | Auditor      | Scope                              | Links                                                       |
| ------------- | ------- | -------------------------------------------------------------------------------- | ------------ | ---------------------------------- | ----------------------------------------------------------- |
| October 2025  | v5.5.0  | [`f5edfc0`](https://github.com/openzeppelin/openzeppelin-contracts/tree/f5edfc0) | OpenZeppelin | SafeERC20, ECDSA, SignatureChecker | [🔗](./2025-10-v5.5.pdf)                                    |
| July 2025     | v5.4.0  | [`f6fea85`](https://github.com/openzeppelin/openzeppelin-contracts/tree/f6fea85) | OpenZeppelin | v5.4 Changes                       | [🔗](./2025-07-v5.4.pdf)                                    |
| April 2025    | v5.3.0  | [`d4b2e98`](https://github.com/openzeppelin/openzeppelin-contracts/tree/d4b2e98) | OpenZeppelin | v5.3 Changes                       | [🔗](./2025-04-v5.3.pdf)                                    |
| December 2024 | v5.2.0  | [`98d28f9`](https://github.com/openzeppelin/openzeppelin-contracts/tree/98d28f9) | OpenZeppelin | v5.2 Changes                       | [🔗](./2024-12-v5.2.pdf)                                    |
| October 2024  | v5.1.0  | [`aba9ff6`](https://github.com/openzeppelin/openzeppelin-contracts/tree/aba9ff6) | OpenZeppelin | v5.1 Changes                       | [🔗](./2024-10-v5.1.pdf)                                    |
| October 2023  | v5.0.0  | [`b5a3e69`](https://github.com/openzeppelin/openzeppelin-contracts/tree/b5a3e69) | OpenZeppelin | v5.0 Changes                       | [🔗](./2023-10-v5.0.pdf)                                    |
| May 2023      | v4.9.0  | [`91df66c`](https://github.com/openzeppelin/openzeppelin-contracts/tree/91df66c) | OpenZeppelin | v4.9 Changes                       | [🔗](./2023-05-v4.9.pdf)                                    |
| October 2022  | v4.8.0  | [`14f98db`](https://github.com/openzeppelin/openzeppelin-contracts/tree/14f98db) | OpenZeppelin | ERC4626, Checkpoints               | [🔗](./2022-10-ERC4626.pdf) [🔗](./2022-10-Checkpoints.pdf) |
| October 2018  | v2.0.0  | [`dac5bcc`](https://github.com/openzeppelin/openzeppelin-contracts/tree/dac5bcc) | LevelK       | Everything                         | [🔗](./2018-10.pdf)                                         |
| March 2017    | v1.0.4  | [`9c5975a`](https://github.com/openzeppelin/openzeppelin-contracts/tree/9c5975a) | New Alchemy  | Everything                         | [🔗](./2017-03.md)                                          |

# Formal Verification

| Date         | Version | Commit    | Tool    | Scope                                                                                                                            | Links                                |
| ------------ | ------- | --------- | ------- | -------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------ |
| May 2022     | v4.7.0  | `109778c` | Certora | Initializable, GovernorPreventLateQuorum, ERC1155Burnable, ERC1155Pausable, ERC1155Supply, ERC1155Holder, ERC1155Receiver        | [🔗](../fv/reports/2022-05.pdf) |
| March 2022   | v4.4.0  | `4088540` | Certora | ERC20Votes, ERC20FlashMint, ERC20Wrapper, TimelockController, ERC721Votes, Votes, AccessControl, ERC1155                         | [🔗](../fv/reports/2022-03.pdf) |
| October 2021 | v4.4.0  | `4088540` | Certora | Governor, GovernorCountingSimple, GovernorProposalThreshold, GovernorTimelockControl, GovernorVotes, GovernorVotesQuorumFraction | [🔗](../fv/reports/2021-10.pdf) |
