> 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. * 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. **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** * * The latest official version of Mempool can be used for deployment and operation. **Ord** * * Use the latest official version of Ord, configure ordinals to the activation height of 21000. **UniSat Open API** * API Swagger: * How to get API-KEY: * Endpoint: