Frequently Asked Questions

How do I renew my certification? +

You will receive an email 14 calendar days prior to your certificate expiration. In order to remain certified, submit the renewal fee and retake the exam prior to the certification expiration date. Upon passing the exam, you will receive email confirmation containing your new certificate ID. If you do not successfully complete the exam prior to the expiration date, you will be required to pay both the enrollment fee, as well as the certification fee, to recertify.

I love what you're doing and want to help. How can I get started? +

C4 is a non-profit organization run mostly by volunteers. If you possess knowledge about cryptocurrencies and would like to use this knowledge to help accurately measure this knowledge in others, we'd love to have you on one of our committees. Please contact us at

I just completed my exam and saw two questions that seemed similar. Why? +

C4's exams are compiled from a database of questions significantly larger than the exam itself. When being compiled, a few questions are randomly chosen from each of the topics within that certification's Common Body of Knowledge. While it should be rare, it's possible that two similar questions can be chosen from a single topic.

What happens if I fail my exam? +

In the event you fail your exam, you will be able to retake it by paying the examination fee a second time. Once you've successfully passed your exam you can then complete your application for certification.

I just completed my exam and answered a few questions incorrectly. Can I see these answers? +

In order to maintain a high level of integrity of C4's exams, the results are kept private. This is to minimize the opportunity for cheating and ensure that anyone who successfully passes an examination truly posesses the level of knowledge associated with its certification.

What does C4 do with the examination and application fees? +

C4 is a non-profit organization dedicated to measuring cryptocurrency knowledge in its applicants. The majority of the fees go to supporting our daily operations including costs associated with the development, hosting, and improvements of our website, our offices, educational materials, licensing fees for our third party vendors, and issuing certificates by mail to those who achieve certification.

How do I learn about Bitcoin and/or other cryptocurrencies? +

We offer study guides to prepare for the Certified Bitcoin Professional exam and the Certified Ethereum Professional exam. We also have several other study materials available. View our options at To learn about cryptocurrencies and blockchain projects from leading experts, view FREE videos on our YouTube channel.

There is also a lot of open-source information out there that will teach you much more than what is required to pass C4 exams. If you excel at self-study, the best way to learn is by teaching yourself!