I want to know that is there any way in which I can use my hardware token containing digital signature (issued by my country CA) to sign a transaction in hyperledger fabric or any other blockchain framework. I know that there is a concept of external CA in hyperledger fabric but that doesn't apply to a real world CA.
Real World External CA in Hyperledger Fabric
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At Hyperledger Fabric, every agent has its own certificates. These certificates are always issued by a CA. So, yo can integrate the certificates issued by your country's CA.
For that, you have to define the corresponding MSP instances that you will use. Also, you will require the certificates for each of the agents that you will set up.