Is there not a way to make it completely impossible to create another vanity address that bears the same initials with one that's already created before?, like it is when you get an error like "this username has been taken" when trying to create a username that matches with another username in a forum .
That is not how creating addresses work.
When you generate an address, you first generate a private key, and you then perform a number of calculations on the private key to eventually get the address. No part of this process involves updating any kind of database containing all addresses ever generated, nor does it involve checking if a similar address has been generated.
Do you have any idea?, lets discuss and learn together.
In order to generate a vanity address, you essentially need to generate a private key, and check if the corresponding address meets your criteria, and repeat this process until you have a private key associated with an address that meets your specific criteria.
There are a number of programs out there that help you with this. As others have written, you should not allow any website or business to generate private keys for you, as they will have access to any coin to send to these addresses.
You can write a program that generates private key/address combinations and uses regex to check if the address meets what you are looking for.
