You can get free Sea of Thieves ship cosmetics by watching Twitch Rivals Event next week. The Twitch Rivals Sea of Thieves Showdown starts from July 23 and will end on July 24, 2019. Teams of big-time streamers will face each other in a series of PvP series to win a big part of the $100,000 prize pool.
You can get free Obsidian figurehead and hull just by watching a minimum of 30 minutes of gameplay on the first day. However, you will also get Obsidian sail and flag if you watch 30 minutes of gameplay on the second day, which is July 24, 2019. You can get these items by only watching 30 minutes of gameplay on both days of the event. You can watch the live-action on Sea of Thieves channel on Twitch but remember if you want to get free rewards, then you will need to link your Twitch account and Xbox account. Sadly, this is not a costly reward but still its a pretty good-looking set overall.
You can visit seaofthieves.com to get the information on how to get free rewards, and some other additional information is also available on this site.