Decentral Bank Fixes Bug that Let One User Mint 10 Trillion $USN for just $10

DAO Decentral Bank, which issues NEAR's native stablecoin $USN, has fixed a smart contract bug that briefly caused about 10 trillion $USN tokens to be minted. The team has burned the tokens and plans to reward the affected user with a bug bounty. It is reported that when a user converts $USN to $USDT via Decentral Bank, if there is no $USDT in their wallet it causes the transaction to fail and also causes the number of refunds to expand by a factor of 1 trillion due to a counting error when the contract is refunded. A user exchanging 5 $USN for $USDT caused the contract to refund nearly 10 trillion $USN after two attempts due to a vulnerability. Decentral bank has now deployed a fix.