FxWithdrawERC20 (index_topic_1address rootToken, index_topic_2address childToken, index_topic_3address userAddress, uint256 amount)
[topic 0]:0x1a77c658a097b28097b54b8acb928a569a3830a6cbed2de1f60001c0757eb0d6
0x0000000000000000000000000000000000000000000000000de0b6b3a7640000