> For the complete documentation index, see [llms.txt](https://firehose.streamingfast.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://firehose.streamingfast.io/firehose/overview/chains/ethereum/katana.md).

# Katana

This page provides Katana specific configuration. First read the [Ethereum general notes](/firehose/overview/chains/ethereum.md) for common information.

## Docker Image

```
ghcr.io/streamingfast/go-ethereum:optimism-<version>-fh3.0
```

[View available versions on GitHub Packages](https://github.com/streamingfast/go-ethereum/pkgs/container/go-ethereum)

Katana is built on the OP Stack, so it uses the same Firehose-patched OP Geth. The image contains both the binary and `fireeth`.

## Client Binary

| Client                     | Repository                                                        |
| -------------------------- | ----------------------------------------------------------------- |
| OP Geth (Firehose-patched) | [streamingfast/op-geth](https://github.com/streamingfast/op-geth) |

## Networks

| Network        | Chain Name       |
| -------------- | ---------------- |
| Katana Mainnet | `katana-mainnet` |

## OP Node Dependency

{% hint style="warning" %}
Katana requires an OP Node (consensus client) running alongside OP Geth with a custom rollup configuration. The OP Node connects to Ethereum L1 for state derivation.
{% endhint %}

## Reader Node Configuration

### Katana Mainnet

```bash
fireeth start reader-node <apps> \
  --advertise-chain-name="katana-mainnet" \
  --reader-node-path="geth" \
  --reader-node-arguments="--datadir={node-data-dir} --networkid=747474 --rollup.sequencerhttp=https://rpc.katana.network --authrpc.addr=0.0.0.0 --authrpc.port=8551 --authrpc.vhosts=* --authrpc.jwtsecret=/path/to/jwt.hex --vmtrace=firehose --state.scheme=hash" \
  <other_flags...>
```

## Key OP Geth Flags

| Flag                     | Description                                     |
| ------------------------ | ----------------------------------------------- |
| `--vmtrace=firehose`     | **Required.** Enables Firehose Protocol output  |
| `--networkid`            | Network ID (747474 for Katana Mainnet)          |
| `--rollup.sequencerhttp` | Sequencer endpoint for transaction submission   |
| `--authrpc.jwtsecret`    | Path to JWT secret for OP Node connection       |
| `--state.scheme=hash`    | State storage scheme (Katana uses `hash`)       |
| `--datadir`              | Data directory (use `{node-data-dir}` template) |

## Resources

* [Katana Network](https://katana.network/)
* [streamingfast/op-geth](https://github.com/streamingfast/op-geth)


---

# 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:

```
GET https://firehose.streamingfast.io/firehose/overview/chains/ethereum/katana.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.