SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x00000000000000000000000000000000000000000000000000000000000000001a8c390479cf1e45edf3459b2b26b0132c00a4f395154995803eca0769f9cf8748473f3cf18151fabaf36cb3f072aca023a6d01b45bc52d5c411625861ff628c