I don't fully understand the proposal, but there is some good info in the 

. Seems like most of it is done in the proposed wallet app, with taproot providing the signing permission structure on-chain.

bitcoin

bitdevs

Anzen: Bitcoin’s Self-Custody Trilemma - Luke Childs

Scoresby

I don't fully understand the proposal, but there is some good info in the [design doc](https://github.com/lukechilds/anzen/blob/main/anzen-design.md). Seems like most of it is done in the proposed wallet app, with taproot providing the signing permission structure on-chain.