create user using fabric-ca-client/ verifying id through client identity chaincode(CID)

hyperledger-create.user

# for attribute based access control, insert :ecert options in the attibutes
fabric-ca-client register \
  --id.name user \
  --id.secret password \
  --id.type user \
  --id.affiliation Org1 \
  --id.attrs 'attr=true:ecert, hf.Affiliation=Org1:ecert'

# for enrollment.attrs, attributes named gets copied to ecert
# opt means the attributes can be optional
fabric-ca-client enroll -u http://user@localhost:7054 --enrollment.attrs "some,thing:opt"

# github.com/hyperledger/fabric/core/chaincode/lib/cid
# golang
stub shim.ChaincodeStubInterface
# get msp id from the cert
cid.GetMSPID(stub)