Demo mode: any non-empty signature is accepted. Replace with real Verus signer later.
ODINID: @demo#main
Challenge: gi3CQlw_sVU9ZHhlVcTDpw
Nonce: 7Dz2eelr-5GE_nOI5i5e7qpqediuo3hh
Expires in: 300s
Scan the QR with your ODINID signer to produce a signature for the nonce.