Iran is requiring cargo oil tankers passing through the Strait of Hormuz to pay a transit fee of $1 per barrel in Bitcoin. This marks the first time a sovereign nation has used cryptocurrency on a large scale for international shipping fees. The policy aims to regulate oil tankers, bypass sanctions, and generate revenue, highlighting the strategic importance of the Strait of Hormuz as the 'world's oil valve.' It also serves as a test of the 'petrodollar' system. However, this geopolitical boost has not led to a significant rise in Bitcoin's price, reflecting the current state of financial markets.