Understanding Quantum-Resilience for Your Casa Vault Safety

Quantum-Resilience and Vault Safety

When considering the safety of your vault from a quantum-resilience perspective, it is important to understand how the Casa app manages your Bitcoin addresses and transactions.

Key Points:

• Unused Addresses: In a multisig hierarchical deterministic (HD) wallet like Casa, each device generates unique public keys for each address. If you do not sign a transaction with the other keys and never spend any sats from the vault, the public keys associated with those unused addresses remain unrevealed.
• Change Addresses: When you make a transaction, the Casa app utilizes "change" addresses. This means that the amount sent to a recipient is separated from the remainder of your balance, which is returned to a new, unused address. This process is crucial for maintaining quantum security.
• Protection Against Quantum Threats: By automatically sweeping your balance to fresh, unused, unrevealed addresses, Casa ensures that your Bitcoin remains protected against potential future quantum threats. Only the public keys of addresses that you spend from are exposed on-chain, while the public keys of unused addresses stay hidden.

Conclusion

If you do not sign a transaction with the other keys and never spend any sats from your vault, it is still considered safe from a quantum-resilience perspective. The design of the Casa app inherently protects your funds by keeping unused addresses secure and unrevealed. If you have further questions or need assistance, feel free to reach out for support.