XBT is full of builders, BTC is full of parasites.
https://blossom.primal.net/21aefee78a9fb866406b9a0c0816d6e5cd70c5c356467aa60f869d5e1150d031.mp4
Same asset, two tickers. BTC and XBT both mean Bitcoin, but BTC breaks ISO 4217 rules since BT is Bhutan's country code and global commodities are supposed to start with X. XBT was a proposed fix that never got standardized.