I'm a Laravel developer and I have a project in exchanges field. I need to know how can I generate deposit address for per coin belongs to per user. I want to do this in secure way and I need to best suggestions. Is HD wallets best choice for this situation? Do all coins have HD wallets?
According to https://bitcoin.org/en/glossary/hd-protocol
The Hierarchical Deterministic (HD) key creation and transfer protocol (BIP32), which allows creating child keys from parent keys in a hierarchy. Wallets using the HD protocol are called HD wallets
So this allows you to create lots of addresses just from a Master Key
Are they secure?
As far as you don't leak your mnemonic, all your addresses are safe
Do all coins have HD wallets?
HD wallets provides you a way of managing the addresses more efficiently and easily. So coins don't have wallets, addresses managed by those wallet can hold coins
Hope this was helpful!