You buy a miner and the shares go to your broker.
Your broker ‘loans” your shares to a “short seller”, (for a fee paid to your broker), who uses your shares to short the market.
After your shares are used to short the market by the short seller, the “short seller” returns your shares to your broker, thus no shares have to be covered.
All legal because the short seller was not “naked short” when he shorted , and all shares are accounted for. A brain twisting loophole but all legal IMO!
FWIW SNG