I would like to build a blockchain with Substrate where people can trade with products. They can log in in web, where they can see only their balances and products.I created private/public keypairs to some users. Adding these keys to keystore, modified customSpec.json with adding keys to aura and grandpa. I modified the chain_spec as well. I still see the predefined accounts. Besides that I have some doubt. Every user who want to use my blockchain has to start a new node? As for log in, how can I solve users can log in to the app and see only their balances?
I checked all tutorial which is accessable on substrate.io. I red a lot of posts, blogs, but these question are a dark spot for me. Please help me.