Supports Nostr Connect

[tiero]

What methods are needed for a Nostr Signer to support Fuji app? (Marina mobile, Nostrum etc..)

• getting a pub key to be used in the covenant: would this be ok if we use the nostr pubkey? In the end the address will be different all the time as the constructor parameters will make it change, even if reuse from the same pubkey.

• Get addresses: Do need a dedicated nostr-connect method to get a fresh receiving address (for fuji) and change the address for collateral change?

• sign inputs: we should have a sign_pset method or a more low-level sign_schnorr? The advantage of the sign_pset is the possibility to show more information about what the user is signing in to the app.

• fetch blinders: as we need the factory to blind the change outputs and we may use confidential inputs for the collateral, we need to fetch this?

[tiero]

cc/ @miyo-fuji @easter-monolith @FlyingMonkey0