Nelson Mandela making the cast [Photo: Courtesy]

A crypto-currency firm has purchased four solid gold castings of the hands of South Africa's first black President Nelson Mandela.

According to Bloomberg, Arbitrade bought the casts at a whooping Sh1 billion ($10 million) in bitcoin from a South African businessman Malcolm Duncan.

Duncan made the huge sum after acquiring the casts of Africa’s greatest icon in 2002 for a paltry Sh3.1 million ($31,000), says the BBC.

Arbitrade has already made a Sh5 million in deposit and the company is expected to pay the remainder in quarterly instalments of at least Sh200 million ($2m).

The casts [Photo: Courtesy]

Arbitrade has not been handed the casts yet.

"They take possession when I have the dollar amount in the bank, at two-and-a-quarter million at a time, they take one hand at a time," said Duncan.

Nelson Mandela was South Africa’s first black head of state who served as from 1994 to 1999. He was honoured and celebrated worldwide as an anti-apartheid revolutionary hero after being jailed for 27 years.

He died in 2013.