# Integrated Blockchains

### What is a Blockchain? <a href="#what-is-a-blockchain-protocol" id="what-is-a-blockchain-protocol"></a>

Blockchain can be described as a ledger in which transactions can be noted, authenticated, and verified when necessary. What separates it from standard systems, such as the registry office, is that it does not belong to any authority or institution. That is, there is no central server that stores this ledger.

### Which blockchain should you choose? <a href="#which-blockchain-should-you-choose" id="which-blockchain-should-you-choose"></a>

The choice depends on the use case, the main points to remember are transaction fees, market value, adoption, level of decentralization, transaction completion time, governance model, and sustainability.

The Blockchains we currently support are :

* &#x20; Polygon <img src="/files/B4TPfxbzCNsxXwP7lnTC" alt="" data-size="line">
* &#x20; (Coming soon) Ethereum <img src="/files/CFpc0yOANRQRbGo9MFoS" alt="" data-size="line">


---

# Agent Instructions: 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:

```
GET https://w3block.gitbook.io/w3block-eng/start-here/integrated-blockchains.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.