{"type":"rich","version":"1.0","author_name":"jo (npub1pk…nxwks)","author_url":"https://nostr.ae/npub1pkx92m60skq9pzs90m3yqq9tvwh03xhzc0haeqqc4exjcu7l6ntsanxwks","provider_name":"njump","provider_url":"https://nostr.ae","html":"properties:\n\n. retroactive modification invalidates all subsequent hash states\n\n. multiple FELs may exist across institutions\n\n. verification is possible without revealing sensitive details"}