What's the difference between the client-controlled and multi-institution models?

The client-controlled model is where you holds two-of-three keys and maintain sovereignty over your bitcoin. Unchained Capital holds the third key and acts as a backup or as a trusted cosigner in the case you request us to sign a transaction.

The
multi-institution model is where you hold one key, Unchained holds the other, and Citadel SPV holds the third key. This model is tailored for the needs of multi-person organizations including investments funds or small businesses.