# Infrastructure

- [Overview](https://docs.vultisig.com/infrastructure/overview.md): Vultisig infrastructure: Vultiserver for auto-signing and Relay Server for secure device communication. Trustless design, no tracking.
- [Vultiserver](https://docs.vultisig.com/infrastructure/what-is-vultisigner.md): Vultiserver enables automatic co-signing for Fast Vaults. One-device experience with multi-factor security. Configurable transaction policies.
- [How does a Fast Vault work?](https://docs.vultisig.com/infrastructure/what-is-vultisigner/how-does-vultisigner-work.md): Technical overview of Vultiserver Fast Vault setup. 2-of-2 keygen ceremony, vault share storage in secure enclave, and signing flow.
- [Transaction Policies](https://docs.vultisig.com/infrastructure/what-is-vultisigner/what-can-be-configured.md): Vultiserver transaction policies (coming soon): Spending limits, whitelisted addresses, time delays, and custom rules for automated co-signing.
- [Why is it safe?](https://docs.vultisig.com/infrastructure/what-is-vultisigner/why-is-it-safe.md): Vultiserver security model: Single share can't sign alone, server can't initiate transactions, secure even if compromised. Backup procedures.
- [Relay Server](https://docs.vultisig.com/infrastructure/relay-server.md): Vultisig Relay Server enables encrypted device-to-device communication. End-to-end encrypted keygen and keysign messaging. Open source.


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