War is not good for the world economy in general and bitcoin is also a part of the economy, so it is not surprising that bitcoin or stocks...both fall when war happens.
Just for context. THERE'S NO CEASEFIRE THAT HAPPENED. Both countries are still at war although the Iran said that they will only stop if Israel stops on attacking them.
I read some news related to Iran and Israel today and according to the reports, the situation is still very tense, attacks can happen at any time. But since the ceasefire was announced and except for some incidents that allegedly occurred on the same day, there have been no attacks between the two sides, so far. The news also says there will be talks between Iran and the US next week, so I don't think there will be any more mutual attacks until then.