Fair point. Sybil multisigs. Ideally there’d be an on-chain reputation system with longevity and successful transaction history. But that starts getting fairly complex.

using nostr keys (ideally with a keychain and rotation system, which is under heavy discussion recently) would make this kind of verification a lot easier or even if just for the signatories to use their nost identities to sign events containing the keys they will use, and the relevant UTXO that will be spent

disagree. build it on a zero trust network.