Dear Unleyans, to contact me over XMPP you /should/ be able to trust the address (key) on the flyer, but the self-signed certificate your messaging app will ask you to approve has the 'SHA256 Fingerprint':

8A:DC:7A:AA:D6:A7:24:F2:CD:ED:CA:79:E7:CA:29:30:E5:45:EE:59:74:60:07:A1:20:2E:DF:A4:1D:22:EC:CC

Again happy IM'img 😊