Marathon Digital ([[MARA]] -0.7%) and Riot Blockchain ([[RIOT]] -0.2%) stocks retreat the most after U.S. Treasury proposes reporting large cryptocurrency transfers to the IRS.Other bitcoin (BTC-USD)-related stocks that also that either fell or pared gains after the news — SOS Ltd ([[SOS]] -2.5%), MicroStrategy ([[MSTR]] +1.5%), and Coinbase Global ([[COIN]] +3.1%).Square ([[SQ]] +2.1%) and Tesla ([[TSLA]] +2.8%), both of which hold bitcoin on their balance sheet, h0ld up relatively well.