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While the cryptocurrency market is dominated by Bitcoin, there is a plethora of other digital currencies, including USDC - which Tzoni had already amassed in a separate crypto account.
His frustrations began in February when he decided to transfer some of his USDC coins to his Revolut account.
As a precaution - which Revolut suggests doing - he first sent 10 of the coins, worth $10. It was a success and the funds were credited to his Revolut account.
Days later he tried to make a larger transfer of what he thought was 1,500 USDC. The transfer was completed but, this time, the funds were not credited to his account.
Tzoni says the problem occurred because Revolut's deposit instructions were unclear.
When you transfer cryptocurrency from one account to another, you have to select a network to send it through - like choosing which courier service to use when sending a parcel.
Revolut's deposit instructions say to transfer USDC to it, you have to use a network called Polygon. In his first, successful, deposit Tzoni selected one called "Polygon PoS".
In the second deposit, when he tried to transfer 1,500 USDC, he selected a different network - "Polygon (bridged)".
He thought it would work just as well but says instead it caused the coins to be converted into USDC.e - a different cryptocurrency.
This is what Revolut received. The company does not handle USDC.e coins.