Rouhani's proposal means that Islamic states can trade within themselves without using the U.S Dollar. For starters, this will allow them to bypass sanctions, something that Iran knows all too well about.
Malaysian Prime Minister is already backing this idea. He, in fact, says he had proposed it before but was shot down by the superpowers. He explained;
“We are hearing this for the first time — that Iran and Turkey are of the opinion that we should use an alternative to the US dollar. We can use our own currencies or have a common currency,”
Iran president, Rouhani, has in the last few months been vocal about the U.S and the sanctions his country currently faces and has been seen to stand up to the U.S. One of the ways he plans to go head to head with the superpower is with the launch of a state-owned cryptocurrency. Iran's crypto will be backed by gold. It is likely to launch in mid-2020.
While it is unlikely that the Iranian cryptocurrency holds up to the U.S dollar, a Muslim cryptocurrency could definitely rival the dollar. If other leaders were to join in on the latest proposal and development of the Muslim cryptocurrency takes root, there could be serious competition for the U.S dollar. Not only because of the Muslim coin but the fact that it would be hit from a number of sides. This including the number of state-backed coins chief among which is the Chinese one.