Sounds like a TOTP -> public key nonce of some kind to me. Or quite possibly it's just using the current time as a nonce. I believe nonces are public info any

Sounds like a TOTP -> public key nonce of some kind to me. Or quite possibly it's just using the current time as a nonce. I believe nonces are public info anyway and it doesn't matter if it's predictable (they're often incremental).