to me I could be one of your cosigners because I could verify you are you. In the digital world it is shared secrets but how do I know you are you and not someone who has taken your computer? There is a service for OTP codes for Electrum. I don't know whether that would be interesting for any you.
OTP are good in the traditional web world. I don't understand why they would be good or interesting for crypto.
People feel their own devices are insecure. So they have a private key on one device and a secret shared phrase on the other.
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