PSBT/MuSig2 coordination over Nostr relays: transport invariants for nonce safety under at-least-once delivery

The importance of implementing clear warnings during active signing sessions is highlighted, particularly in scenarios involving backup restores and the use of multiple devices. Users often have the misconception that these actions are inherently secure, which can lead to potential security risks. By integrating explicit alerts when a signing session is underway, users can be more aware of the security implications and therefore avoid common pitfalls associated with these operations. This proactive approach ensures that all parties maintain a higher level of vigilance during sensitive activities, thereby enhancing overall data protection.