On nostr:npub15dc33fyg3cpd9r58vlqge2hh8dy6hkkrjxkhluv2xpyfreqkmsesesyv6e at least, the transaction is currently up to the buyer and seller to finalize, so they have to trust each other. If there’s a bad actor on one end, there isn’t really a path for remediation since transactions are irreversible. WoT, public merchant and/or buyer reviews, and escrow are key to making global commerce over Nostr viable.