I don't understand what is the point of keeping coins on centralized exchanges
this will greatly simplify the development of the application
f you want to have security theater you can just create simple website database of numbers and pretend you are transacting between users.
this is exactly what I planned, people deposit their money from the outside to the my master wallet and then transactions inside the application occur simply by rewriting from one database to another
There are wallets available for multiple currencies and you can just use them, shitcoins usually have low transactions fees, and most of them are worthless centralized junk.
here is the problem, I can imagine how to manually make bitcoin wallets using the ready-made bitcoin-core package, but I don’t quite understand how to manually screw other currencies, besides, this will greatly increase the load on the server (assumption). therefore, I am looking for a third-party service with good api that could provide such an opportunity to generate multiple addresses for one currency and then simply assign each address to a specific user