Demo mode: any non-empty signature is accepted. Replace with real Verus signer later.
ODINID: @demo#main
Challenge: gI3VC-z13x_tVTgLM2JaPw
Nonce: Zi2cqSzXSfP5qkJRD5Hy_PY5iphzp_-x
Expires in: 300s
Scan the QR with your ODINID signer to produce a signature for the nonce.