# Signing Key in Mirror.xyz

By [Robert Mao](https://paragraph.com/@robertmao) · 2021-10-20

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[https://g.mirror.xyz/FNo46PS21mjaAVLu-Nt1HeJT\_yH-8lnm0W-HsjG6px8](https://g.mirror.xyz/FNo46PS21mjaAVLu-Nt1HeJT_yH-8lnm0W-HsjG6px8)

[https://g.mirror.xyz/FNo46PS21mjaAVLu-Nt1HeJT\_yH-8lnm0W-HsjG6px8](https://g.mirror.xyz/FNo46PS21mjaAVLu-Nt1HeJT_yH-8lnm0W-HsjG6px8)

> `In any case, for Mirror, we do store the private key in the browser for signing entry (we call it a "signing key"), but it's not an Ethereum key that we store. The private key we store is a non-exportable type that can never be shared and cannot hold economic value. In the future, adding new devices will be quite easy to do, simply by creating a new signing key on the new device, and then sending that key to the original device to be signed by an Ethereum wallet.`
> 
> `Soon, I'd like to validate if we're able to set up a mobile Chrome browser to be able to write to Mirror, using this method.`

via:

[https://g.mirror.xyz/FNo46PS21mjaAVLu-Nt1HeJT\_yH-8lnm0W-HsjG6px8](https://g.mirror.xyz/FNo46PS21mjaAVLu-Nt1HeJT_yH-8lnm0W-HsjG6px8)

[https://g.mirror.xyz/FNo46PS21mjaAVLu-Nt1HeJT\_yH-8lnm0W-HsjG6px8](https://g.mirror.xyz/FNo46PS21mjaAVLu-Nt1HeJT_yH-8lnm0W-HsjG6px8)

[https://www.arcblock.io/](https://www.arcblock.io/)

[https://www.arcblock.io/](https://www.arcblock.io/)

![](https://storage.googleapis.com/papyrus_images/e4ba8a8b8dcee6bae1759d3f19c28fa6937b611d351eeda8b380813e37955233.png)

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*Originally published on [Robert Mao](https://paragraph.com/@robertmao/signing-key-in-mirror-xyz)*