Cert_issuer problem in bitcoin testnet (models.py)

Ok I have updated the file at the link there. Since it’s not a valid DID it will likely not verify. You might want to point to your own hosted issuer profile, or use a valid DID.
To get started with DIDs I suggest you take a look at https://did.key.transmute.industries. You will need to reference a key into your conf.ini verification_method.