What measures do we have to prove someone mined the bitcoin personally? Similar to how one can say they sold a bunch of copper that they dug out of the ground w

What measures do we have to prove someone mined the bitcoin personally? Similar to how one can say they sold a bunch of copper that they dug out of the ground when really they were paid in copper by illegal sources. The block's "coinbase" mints the reward coins sends it to an address. Put that BTC into one of those privacy coins and back out. Where's the connection to the block it was mined from? Gotta be some fingerprints somewhere. And... > it has since increased to around £3.4bn.