This may be controversial and not privacy-preserving in the best way, but I still want to share this idea.
A multisig protocol where it is just you, the front end, and the chain. No downtime. No other off-chain medium or service. Where Simplicity enables custom policy enforcement rules and multisig spending conditions.
This is a very early experiment to showcase what can be developed with Simplicity. Thus, the paper is not affiliated with Blockstream.