Summary:

• A Programming Language
• Cryptography 101
• Mathematics
• Networking
• Network Security

Good Morning Frèro,
I've done a little research on Blockchain creation and it does require some knowledge on coding. now which particular Programming Language is your choice, but if you truly want to dev a blockchain, coding is essential.

Also, a solid understanding of the basics of Cryptography would help.

with Cryptography also comes Math, I am still not sure which disciplines in Mathematics would be more rewarding though.

Basic knowledge on Network security, also Basic Networking knowledge (Especially TCP/IP)

this is not a comprehensive list at all, but this is what I've noticed I required some knowledge in when researching and attempting to understand what Blockchain tech is and how it functions.

- Hope this helped.