If Wallet X has received the coins from Wallet Y and has never been verified what then?
to be honest is realy easy spot mined coins.
You mine mostly in pools so then between you and pool is 1 adress.
mined > pool wallet > your wallet > exchange wallet.
Is easy to see such structure.
Most cases people mined some hot altcoin > exchange (mostly dead right now - since only "best in kind took those garbage" and sell ) > bitcoin.
So 80% people who mined in low scale in house will have such problem.
Most those
altcoins had to be sold as hot on very risky exchanges - is close to zero prove that you had BTC not from direct mining.
There were also multi mining pools so you were mining something but you were payed in most profitable coin at this moment. Coins you had received was from regular exchange.
Clean situation is very rare like mine BTC > pool > wallet.
Professionals who play that game they won't ask such questions here.
There is close to 0 chance that someone who never mined can pretend that he was mining in the past and prove it to people who know what to check.
Most mulipools died / regular pools also / shity exchanges too , getting evidence via mining is hard. Minig via staking/having supernode is easy since you use your own node to mine. But this is likely like 5% of mining operations.
Summary : is stupid to pretend that you were mining in 2012 but you have coins from 2020/2021 XD... If someone realy mined BTC he will prove that easy. If someone like me mined shitcoins to get BTC - case is almost lost in terms of 100% transparency.
