> For the complete documentation index, see [llms.txt](https://uniport.gitbook.io/uniport-doc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://uniport.gitbook.io/uniport-doc/tutorials/asset-bridging-tutorials/bitcoin-evm-chains.md).

# Bitcoin ➡️ EVM chains

{% hint style="info" %}
Bridging BTC tokens from the Bitcoin network to the Ethereum network as an example:
{% endhint %}

1. Open the UniPort official website, click on "Connect Wallet" in the upper right corner, select BTC network, and connect the Unisat/OKX wallet extension;<br>

   <figure><img src="/files/kpEiCFtHgz3UAHqiMUqx" alt=""><figcaption></figcaption></figure>

   <figure><img src="/files/9ixa5WBGNZwcAgMIqCPP" alt=""><figcaption></figcaption></figure>

2. In the "Choose Token" menu, select BTC, input the quantity of BTC to be cross-chained to Ethereum, and the Ethereum receiving address, then click "Transfer";<br>

   <figure><img src="/files/gUjthEfqRzDSFhMWJx0T" alt=""><figcaption></figcaption></figure>

   <figure><img src="/files/ge50hwWvrrBQRVlx63Qf" alt=""><figcaption></figcaption></figure>

3. Click "Confirm & Send" to confirm the transaction;<br>

   <figure><img src="/files/6SV013doD0aAbcaFAZm5" alt=""><figcaption></figcaption></figure>

4. You can view the transaction history in the "Activity" menu.<br>

   <figure><img src="/files/BeYDDopslFbflQRIojU2" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
**Precautions：**

Due to the unique characteristics of ARC20 assets, where each token is represented by Satoshis, users may encounter their balance displaying as zero during cross-chain transfers. However, the assets remain secure and there is no need for concern.

For example, if a user has a balance of 6000 QUARK on the Bitcoin network and initiates a cross-chain transaction to transfer 2000 QUARK, their wallet's QUARK balance may temporarily show as zero. Once the transaction is successfully completed, the wallet's QUARK balance will automatically update to the correct amount of 4000.
{% endhint %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://uniport.gitbook.io/uniport-doc/tutorials/asset-bridging-tutorials/bitcoin-evm-chains.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.