5. Attester signs up
npx ts-node cli/index.ts attesterSignUp \
    -x $UNIREP_CONTRACT_ADDRESS  \
    -d $ATTESTER_PRIVATE_KEY
info
NOTE: -d is attester's private key, this private key is to be used only by this attester hereafter
See: cli/attesterSignUp for more attesterSignUp options.
- The attester ID will be printed, for example
 
Attester sign up with attester id: 1
Export Attester Id to the environment:
export ATTESTER_ID=1