BackingBufferSet (uint192 oldVal, uint192 newVal)
[topic 0]:0x4ec8ac3ba3ecc0b9d7690e98f4bf8f5c70b8f2a9b4326c757b44ba3d19c18796
0x00000000000000000000000000000000000000000000000000071afd498d000000000000000000000000000000000000000000000000000000038d7ea4c68000