Writing and Reading

      [1] Precious metals have been used in coins throughout history. [2] Cryptocurrencies typically rely on a distributed computing system known as blockchain. [3] Blockchain has several advantages that appeal to cryptocurrency users and designers, but because it relies on computers, it also relies on the minerals that are used to produce computers. [4] So it's somewhat ironic that they have a new, vital role to play in the rise of cryptocurrencies, which are billed as a radical departure from traditional money. [5] One of the unanticipated side effects of the cryptocurrency's growing utilization is a shortage of high-end graphics cards. [6] The blockchain equations that enable cryptocurrencies to function require massive computing power, which relies on the best graphics cards. [7] These cards are made with pricey materials, such as the platinum group metals, and increased demand is leading to rising prices.

To make this paragraph most logical, sentence 4 should be placed