Crypto sold off as U.S. strikes on Iran jolted weekend markets

U.S. forces struck the Fordow, Natanz and Esfahan nuclear facilities in Iran between 6:40 p.m. and 7:05 p.m. Eastern time on June 21, 2025, introducing a major geopolitical shock while most conventional financial markets were closed. Cryptocurrency prices weakened as the news emerged, making the continuously traded digital-asset market one of the first observable venues for investors’ response.

The development mattered beyond the initial price move. Bitcoin was often described as either a geopolitical hedge or a high-risk macro asset, and the weekend reaction offered a real-time test of those competing narratives. The evidence from June 21 supported the risk-asset interpretation in the immediate window, although it could not establish how markets would behave once stocks, bonds, currencies and oil reopened.

The dated snapshot showed uneven losses

CoinMarketCap’s June 21 historical snapshot placed bitcoin at $102,257.41, down 1.02% over its rolling 24-hour window and 3.05% over seven days. The provider reported an estimated bitcoin market capitalization of $2.033 trillion and estimated 24-hour volume of $38.361 billion.

Ether was quoted at $2,300.50, down 4.44% over 24 hours and 9.19% over seven days. Its reported market capitalization was $277.716 billion, with estimated 24-hour volume of $16.109 billion. Ether therefore underperformed bitcoin by 3.42 percentage points over the displayed 24-hour windows and 6.14 percentage points over seven days. Those differences are calculations from CoinMarketCap’s published percentage changes.

Other large assets also weakened. The same snapshot recorded XRP down 2.96%, solana down 3.57% and dogecoin down 5.11% over their respective rolling 24-hour windows. The dispersion indicated a broad but unequal retreat rather than a uniform repricing across every token.

These figures require caution. CoinMarketCap aggregates trading across multiple venues, and its accessible historical page does not identify the snapshot’s precise timestamp, venue weights or revision history. Its volume and capitalization figures are provider estimates, not audited consolidated-market totals. The displayed percentage changes are rolling windows attached to the snapshot, not returns between regulated exchange closes.

The first reaction was visible before other markets opened

Contemporaneous Reuters reporting published as the news broke said ether had fallen more than 5% while bitcoin dipped about 1%. Reuters did not specify a single exchange, exact observation timestamp or calculation methodology in the accessible report, so its percentages should be treated as an immediate market reading rather than a reproducible consolidated return.

The direction nevertheless aligned with CoinMarketCap’s dated snapshot: bitcoin declined, but ether and several other large tokens fell more sharply. This does not prove that the military action alone caused every move. Crypto assets had already been weakening during a week shaped by the Israel-Iran conflict, interest-rate uncertainty and reduced risk appetite.

The timing does support a narrower interpretation. Because cryptocurrency markets remained open on Saturday, June 21, they absorbed the surprise before most traditional assets could respond. That made crypto a visible weekend sentiment gauge, but not necessarily an accurate forecast for oil, equities or currencies.

What the move did not establish

The June 21 decline did not demonstrate that bitcoin had failed permanently as a store of value, that $100,000 would hold, or that ether’s larger loss reflected a change in Ethereum’s protocol fundamentals. It recorded a short-window risk response under thin and fragmented weekend conditions.

Market depth varies across exchanges, derivatives can amplify spot movements and reporting services do not capture every liquidation. Without venue-level order books, positioning and synchronized cross-market data, claims about the precise transmission mechanism remain interpretations rather than verified facts.

Next-day confirmation

A U.S. Defense Department briefing on June 22 identified the operation as Midnight Hammer and supplied the exact strike timeline. Bloomberg subsequently reported that bitcoin fell as low as $98,904 and ether to approximately $2,157 on June 22. Those next-day lows are later context and are not presented as June 21 prices.