Hello! I am new person in blockchain technology and I want to fasten my knowledges by writing own primitive version of blockchain. I can not understand where will be my blockchain store wallets public addresses for transactions between users. Should I use helpful database like a MongoDB or MySQL for these purposes?
I think you can Read this article. It will help you a lot to understand the storing sytem.
https://www.bitcoinofamerica.org/blog/where-is-blockchain-stored/