> For the complete documentation index, see [llms.txt](https://docs.fractalbitcoin.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fractalbitcoin.io/doc/wallet-integration.md).

# Wallet Integration

This document is intended for wallet application providers that have already integrated the BTC mainnet, to facilitate the integration of the Fractal testnet into their applications.

## **Node**

Fractal Bitcoin and Bitcoin have the following differences and notes on nodes:

* Solo mining uses the same mechanism as Bitcoin.
* Merged mining operates similarly to Namecoin.
* Blocks from merged mining contain the BTC block header data. The data structure has changed.<https://en.bitcoin.it/wiki/Merged_mining_specification>
* However, to maintain compatibility with existing applications, the block data will be removed in the getblock and getblockheader methods of the RPC interface. Nevertheless, analyzing local block files will reveal this data.

## **Protocol**

We remain neutral regarding the competition of different protocols.

**Ordinals**

* The activation height of the ordinals index is 21000.&#x20;

**BRC20**

* Ticker names on this public testnet will be limited to **6 - 12 bytes**. Tickers with 4 or 5 characters will not be permitted, as they are already in use on the Bitcoin mainnet.
* For brc-20 on Fractal, ticker names can include letters (both uppercase and lowercase: **a-z/A-Z**), numbers (**0-9**), and underscores (**\_**). In total, you have 63 different characters to work with.
* All byte lengths of BRC-20s on Fractal can enable the self\_mint field.

**Runes Protocol**

* The activation height for runes is 84000.
* More rules will be announced later.

##

## **RPC & API**

\
**Mempool API**

* <https://mempool-testnet.fractalbitcoin.io/v1/fees/recommended>
* The latest official version of Mempool can be used for deployment and operation.

**Ord**

* <https://ordinals-testnet.fractalbitcoin.io>
* Use the latest official version of Ord, configure ordinals to the activation height of 21000.

**UniSat Open API**

* API Swagger: <https://open-api-fractal.unisat.io/swagger.html>
* How to get API-KEY: <https://developer.unisat.io/dashboard/fractal/testnet>
* Endpoint: <https://open-api-fractal-testnet.unisat.io>


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