# SignatureChecker using Metamask

**URL:** <https://forum.openzeppelin.com/t/signaturechecker-using-metamask/27452>\
**Category:** Smart Contracts\
**Created:** [April 11, 2022, 9:49pm UTC](https://forum.openzeppelin.com/t/signaturechecker-using-metamask/27452 "2022-04-11T21:49:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Waqas\_Aslam](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/waqas_aslam/32/9546_2.png) [@Waqas\_Aslam](https://forum.openzeppelin.com/u/Waqas_Aslam)\
**Post date:** [April 11, 2022, 9:49pm UTC](https://forum.openzeppelin.com/t/signaturechecker-using-metamask/27452/1 "2022-04-11T21:49:29Z")

</div>

Hi, I have seen the documentation related to EIP-712 where suggested that metamask supports EIP712 using \_hashTypedDataV4. My question is that is OZ-SignatureChecker supported in metamask?  
I have my ERC721 & ERC1155 including the lazy-minting feature with OZ-SignatureChecker implementation. It is working fine for my own custom wallet. But I don't know how to integrate this existing solution with metamask as well. Please help me in this regard. Thanks

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