An analysis of the private key handover pattern as a building block for Bitcoin protocols, especially those using Taproot and MuSig2, to allow smoother fund transfer, reduced protocol complexity, and better transaction flexibility.

The core concept is that ownership of a shared UTXO must pass to a single participant. Participants can hand over their ephemeral private keys used in a MuSig2 keyspend path. The beneficiary who collects all other participants’ ephemeral private keys can then claim the UTXO alone via the keyspend path.

Example: In a Hash Time-Locked Contract (HTLC), the offerer hands the ephemeral private key to the acceptor once the preimage is known, giving the acceptor full control of the fund without extra coordination.

Sounds obtuse to me, however there are probably cases that need such thing.