Hi weex
Ive published the verifier script -- it uses blockchain.info and chain.so to check the transaction referenced is unspent.
https://github.com/MiWCryptoCurrency/UTXOC/blob/master/verifyutxoc.py

I also updated the generate script to take attributes, similar to how openssl req -new works.
new code is here https://github.com/MiWCryptoCurrency/UTXOC

I have also generated a 'dogecoin' cert, https://github.com/MiWCryptoCurrency/UTXOC/blob/master/doge.crt which is signed by the UTXOC-CA.crt "Root Cert"
This is an example of a chained cred; you have a 0.01 BTC certifying a 11.02 DOGE certificate :-)

I would like to set up some kind of SCEP service that signs valid CSRs; next step :-)