Can Strapi 4 be used to create NFT marketplace?

General
1
  1. Is it possible to create an NFT marketiplace like opensea.io using Strapi 4.0?
    2.If not will Strapi 4.x support native blockchain integrations?
    3.Does Strapi support CockroachDB?
2

Simple answer: yes
Not so simple answer:
The backend part of the marketplace can be built with strapi (or any other framework like express, koa, etc)
but for the nft bit, you will have to find ways to interact with the blockchain (out of scope for the backend)