For a limited time, Sea of Thieves players can hand over a variety of Twitch Drops available for the game during the month of June. You have a specific requirement to make before claiming it, so make sure you meet the requirements. These Twitch Drops will only be available from June 3 to June 17. They were made available to celebrate Sea of Thieves' Arrival at Steam.
You need to jump to the Sea of Thieves Twitch repository page on the developer's main website. Once here, you need to log in or create a Twitch Account. You will need to follow the account steps on the Twitch website to activate it. When you've activated it, you can then link your Twitch account to your Sea of Thieves account, but you'll need a Microsoft Account to connect the two.
You can sign up for one on the primary Sea of Thieves page. After you finish, you can connect Microsoft and Twitch accounts. The website will ask if you want to allow it and you need to confirm the permission for the connection to work. After logging in, you must then accept the terms and services. After that, the two should work together, and any rewards you receive for the Twitch Drop will now go to your Sea of Thieves Account.
Once the accounts are logged in and working together, you'll need to catch one of the verified Twitch Sea of Streamer Thieves. These are Sea of Thieves partners. You can find them in the Sea of Thieves list of available on his Twitch page. Choose one of the available streamers and watch them on your logged in account for at least 30 minutes. You will receive the rewards after doing so.
You can collect your Twitch Drop from your Pirate Vault, which you can find aboard your ship or at one of the outposts. It will vary depending on the type of item it is, for example for your ship, the appearance of your pirate or his weaponry.
Each day has a new reward.