YieldMargin (uint256 oldMargin, uint256 newMargin)
[topic 0]:0x831f5ac7bcbd8b642cad5f182f7ee8f5f009a246d7f8ff3b9fb8b954bd093335
0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000