Quote from: wsxdrfv on May 09, 2018, 06:29:20 AM

Quote from: network.decentralizer on May 02, 2018, 07:12:56 PM

There are 2 options:
2) (Not recommended) Each user has an unique ID and new addresses are generated via seed, so they are actually pre-generated and easy to recover if you now the seed. Then it goes like that:
[seed]-> [Purpose][Coin][Account][External / Internal][address id]

m/44'/0'/111'/0/1 -> Bitcoin address, user_id 112, second address
m/44'/145'/48271'/0/3 -> Bitcoin Cash address, user_id 48271, fourth address
m/49'/0'/54'/0/0 -> Bitcoin SegWit address, user_id 55, first address

What are these seed? m/44'/0'/111'/0/1, m/44'/145'/48271'/0/3 , m/49'/0'/54'/0/0

I just thought made bunch of address from one bitcoin daemon.

Where is seed and how to know what seed used from above?

First: I don't like this approach. It is kinda 'dirty'.

The seed is your mnemonic seed. Your 12/18/24 word seed.
m/0'/0'/0 is a derivation path (specified in BIP 32).

If you want to use a seed you have to actively generate one. Then derive private-/public- keypairs from your seed.

A better approach would be to use the xpub key or to generate a bunch of addresses and store them in your database. Then just link user ID's to the addresses in your database.