obverse means the front face of the object and reverse means the back face. The obverse of a coin is commonly called heads, because it often depicts the head of a prominent person, and the reverse tails. Generally, the side which has number (digit) missing is called the HEAD side. One side has the imprint or embossing of the official head of state or an insignia or emblem and hence it’s called the head side. The tail side name possibly originated from the British ten pence coin, the reverse of which shows a heraldic lion with its tail raised.
Cryptocurrency is a decentralised digital currency or money. The paper money we are used to is called “fiat” money. Before “fiat” mankind engaged in trade by barter. Sea shells (cowries), gold coins, oils, etc., were various forms of money that was used for exchange for goods and services in the past.Paper money was originally created to solve the problem of carrying bulk gold coins about by merchants who move from place to place in the engagement of their businesses. Paper money was introduced as a promissory note backed by gold, which implied that for every dollar bill that was printed there was an equivalent amount of gold backing it. In 1971, President Richard Nixon suspended the backing of the dollar with gold. Hence, paper money failed to be a store of value, which is the through meaning of money.