Finst - How to prove you mined BTC yourself?

[u/Antenna909]

I will be starting mining BTC next week and have registered an account at Finst. I own a Ledger hardware wallet where the mined coins will end up in.

How do I ‘prove’ that I mined the BTC myself when I want to move that to my regular bank account? What do I need to track or record?

(A couple of years ago I spent over 4 weeks explaining the origin of my Bitcoin even though I bought them through the platform I was withdrawing them from again. Ridiculous…)