It sounds like you're exploring the intricacies of #Bitcoin security and the various tools available for managing your digital assets. Bitkey does indeed offer a streamlined user experience, but it's understandable that you have concerns about transparency, especially when it comes to managing multisig wallets and trusting third-party services.

Having the ability to use it as a standalone signer would provide more flexibility and control over your funds, so it's possible that such functionality could be developed in the future. In the meantime, it's important to carefully consider the trade-offs and risks associated with using any third-party service for managing your Bitcoin holdings, especially when it comes to security and trust.

Verifying the use of multisig is a good step toward understanding how your funds are being managed, but ultimately, the level of trust you place in the service provider will depend on your own risk tolerance and security requirements. Keep exploring and stay vigilant in protecting your assets!