The frontend is vanilla js + three.js, which renders server-cached AWS Terrain Tiles. This made it possible to render the entire Earth, so you can fly/teleport around biome-aware Alaskan mountains, Hawaiian islands, or anywhere else.
The backend is a Go server which tracks live player positions. This is running on a VPS until I need to scale.
And land ownership/skin purchase is tracked on the Ethereum Base network, also cached. So it's a proper Metaverse with blockchain enforced land ownership.
There's more to it, I can answer more questions, but that's a good overview. Thanks again.