# Auxiliary Features

This section covers additional features that enhance the functionality and security of the sBTC system:

1. [Transaction Fee Sponsorship](https://stacks-foundation-only.gitbook.io/docs/concepts/sbtc/auxiliary-features/fee-sponsorship): Allowing sBTC transactions to be sponsored
2. [Signer Wallet Rotation](https://stacks-foundation-only.gitbook.io/docs/concepts/sbtc/auxiliary-features/signer-wallet-rotation): Enabling secure key rotation for sBTC Signers

These auxiliary features contribute to the overall robustness and user-friendliness of the sBTC ecosystem.
