How to get check mark in the verification screen

when you go to verify let say on my server there is the check mark near the name and on other servers that use restore cord they dont have that check mark so I was just wandering how I got it

if you have more than 1000 verified members you will get a verified badge

oh thats nice thanks for the fast response. also to transfer members to another server the custom bot has to be in that server too?