We don’t have an official Unity integration at the moment, but if you are interested in streaming 3D Tiles to other clients you’ll want to use the Cesium ion REST API: https://cesium.com/docs/rest-api/
You first make a request to the asset: https://cesium.com/docs/rest-api/#operation/getAssetEndpoint
This gives you a new token and a URL you can use to access the tiles. The tileset.json is the entry point for 3D Tiles which lists all the individual tiles (the b3dm’s for example). You may find the 3D Tiles Overview helpful here too: https://github.com/CesiumGS/3d-tiles/tree/master/overview#3d-tiles-overview