Former US President Donald Trump's cryptocurrency platform had a rocky start on Tuesday, with only a handful of investors buying units of his digital currency that were made available for sale.

The Republican candidate for the US presidency announced in mid-September that he, his sons and businessmen would launch the World Liberty Financial platform.

The company offered 20 billion units of the digital currency at 1.5 cents each, totaling $300 million, but only 3 percent of it had been sold by Tuesday evening.

The units can be used as cryptocurrencies and also allow buyers to vote on the management of the platform.

Many observers attributed the low sales to technical problems, as the company's website experienced malfunctions earlier in the day.

The World Liberty Financial platform will allow users to lend or borrow cryptocurrencies from each other, a service provided by many platforms, the most famous of which is Aave.

During his presidency, Trump referred to cryptocurrencies as a fraud, but he has since changed his position, presenting himself as a pro-Bitcoin president if elected in November.