https://docs.digitalocean.com/products/networking/dns/quickstart/
1. whois
Set Up Domains To set up a domain with DigitalOcean, you need to add it (and any of its existing DNS records to the control panel, then delegate the domain by updating your registrar to use DigitalOcean’s name servers.
2. history
https://github.com/indianajson/can-i-take-over-dns/issues/22
Explanation To perform a takeover create a new account on Digital Ocean and follow the DNS quick start guide. In short, once inside the Dashboard click on the big green Create button and select Domains/DNS. Enter the vulnerable domain in the form field labeled Enter domain. If the page allows you to create the zone the takeover was successful. Digital Ocean's vulnerability to DNS takeovers was discussed in detail by Matthew Bryant in 2016 and they are still vulnerable today.