It is called nostr, it uses BIP 340 keys already

Interesting. We're keen to eventually support 2:3 multisig in Rigly for an end-to-end escrow; however, the user experience for multisig right now is very rough, support for PSBT to do multisig across diff wallets is mixed, and sharing keys is cumbersome - support for a key network could be useful.

I'm here for the evolution of multiple kinds of institutions at multiple points in the sovereignty / convenience gradient.