SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x000000000000000000000000000000000000000000000000000000000000000029172c1a3a7c30f2a2145152f72abcc50fca004f5c976a1a090225e47129a8619c2f076bf828b4e8bcad1d91f544f98bf72ff33ed03810486ea80e3c2d9687c0