Adam Back Rebukes Mark Cuban After Cuban Sells Most Bitcoin

Blockstream CEO Adam Back challenged Mark Cuban after Cuban disclosed he had sold most of his Bitcoin holdings. Back cited market data he described as at odds with Cuban’s claim that Bitcoin has “lost the plot.”

Cuban wrote that he sold most of his Bitcoin because the token failed to act as an inflation and geopolitical hedge when gold surged and Bitcoin previously declined by more than 40%. He has expressed greater optimism about Ethereum going forward. Cuban pointed to a period when gold approached roughly $5,000 as part of his critique.

Back highlighted short-term performance after regional tensions escalated, saying Bitcoin climbed about 25–30% from a low near $60,000. Over the same window, the S&P 500 gained about 11%, the Dow Jones Industrial Average rose about 5%, and gold fell roughly 14%. Back wrote: “Bitcoin is up 25-30% from the ~$60k bottom … vs S&P500 up 11%, DJIA up 5%. and gold fell -14%. so i don’t know what @mcuban is trying to say .. doesn’t line up with data unless he sold the bottom.”

Back attributed the earlier steep drop in Bitcoin’s price to what he called a “10/10 event” and to normal halving-period cycles, which he described as separate from gold’s gains tied to geopolitical events. He added: “You don’t get the outlier Sharpe ratio over longer durations, without volatility. So it comes with the territory.” Back also noted that, by his measures, Bitcoin’s risk-adjusted returns over multiple years have exceeded those of equities, gold, and real estate.

Some long-term model followers responded to Cuban’s critique by arguing the billionaire misunderstood Bitcoin’s historical price behavior, saying the asset tends to move through recurring phases at different scales and that its structural behavior has not changed.

The exchange of views between Cuban and Back unfolded on social media, with both men posting their positions and supporting data.