# FastBTC

FastBTC is the service that facilitates fast transfers from BTC (on the Bitcoin blockchain) to rBTC (on RSK), and vice versa. It consists of two separate systems

* BTC -> RSK FastBTC
* [RSK -> BTC FastBTC (bidirectional FastBTC)](https://build.sovryn.com/builder-portal/smart-contracts/fastbtc/rsk-to-btc)