We have deployed all our application's contracts on the Arbitrum one mainnet , here are their details  : 

1. Username minting : 0x997760cEd2645e9BcCD261D70A6BB0299Dab4D8f

2. Donation contract : 0x74e4ad66e2c583b1FEd9269EC8Dbc4Bd49fa9e75