Here are some invite codes to claim usernames on nostriches.club and plebchain.club:

c31fbae9224c5d5d50c2edf7cc4e1716

de97a6411984e216dbb79f512895505e

51bbe8767ae9214039218c48d845dfb9

5fc687af17c3c0c256cdaba4355ea497

https://nostrcheck.me/register