I have some questions that need clarification.
Lets say if I create a trade-in website using blockchain technology,
First, do I store all sort of data into blockchain such as user credentials, user info, product info, etc? I'm sure
trade data between the users need to be stored in the blockchain, but what about other data I mentioned above?
Second, since user credentials are private data, shouldn't they be stored in other database like sql-server?
Third, if they can be stored and retrieved from other database, does ethereum dapp provide any functionality to pull those APIs? (ex: .Net Core API)
Last but not least, is it also a good approach to store other data such as each product information into blockchain? (worried about too much data in blockchain?)
Thanks in advance.