Participants retain separate secret shares. In an actual threshold-signing protocol, they exchange protocol messages and contribute to a signature. The scene does not reconstruct a complete private key in the middle.
Key setup matters. Trusted-dealer creation and distributed key generation have different exposure histories. “The key never existed” is not a universal property of every MPC deployment.
Threshold signing does not establish legal entitlement, verify an heir, or replace recovery planning. Collusion and operational failures still matter. Cryptographic availability and organizational approval are separate conditions.