SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000efda4fbd60199c4735519eaa764484fe5780bdc1787ce28d3d58c99af24413bd2b4e43d4c49243bfaff931d37e96c18ca147f7eb939f8a3a385d9592ac960abe