It is a nostr nest where they place bets on properties of an upcoming block. e.g. They pick a block height in the future, and lay up to 1k sats down on the last character, allowing for only 2 characte...

https://video.nostr.build/2a310f2dbc579cf801054b2ec9533bd5cca6a4e49c602dbb9278e1e0cc44d8ec.mp4

Happy new year 🎊