# Update Chain Metadata in Polkadot Vault

Due to the fact that your **Polkadot Vault Device** is always offline and is air-gapped, there is a unique system in which you must partake to update the chain metadata so that your transactions are valid. You can use the [Novasama Technologies Metadata Portal](https://metadata.novasama.io/#/polkadot) to find QR codes which will provide your **Polkadot Vault Device** with the information required to update the chain metadata.

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The following steps need to be carried out on your **Polkadot Vault Device**.
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1. Navigate to the [Novasama Technologies Metadata Portal](https://metadata.novasama.io/#/polkadot). (Note: This should be done on a device which is not your Polkadot Vault Device.)
2. `Select` the appropriate **blockchain** that you wish to update the metadata for.
3. If you are updating a chain for the first time, `Select` the **Chain Specs** tab at the top of the metadata portal screen.
4. Using your Polkadot Vault Device `Select` **Scanner**.
5. Scan the **Chain Specs QR code** with your Polkadot Vault Device.
6. Review the verifier certificate, and `Select` **Approve**.
7. `Select` the **Metadata** tab at the top of the metadata portal screen.
8. Using your Polkadot Vault Device `Select` **Add Network Metadata** on the screen that appeared after adding the chain specs, otherwise `Select` **Scanner**.
9. Scan the **Metadata QR code** with your Polkadot Vault Device. (Note: this can take a few minutes to complete.)
10. Review the verifier certificate and `Select` **Approve**.