One of the lead developers, @kim, talks about it here.
Ensure you’ve transferred sufficient funds to your issuing address to cover the transaction fee:
- The transaction fee is the same no matter the number of certificates in the batch.
- The default transaction fee used by cert-issuer is ~$1.50 USD.
- Because the transaction fee is a factor in confirmation time, you may decide to increase or decrease this value in the config file.
If you can get an interview and spread around the fact that it’s cheap to issue a batch of certificates, then that’ll help the digital verification movement. So good luck on that thesis 