SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000002498ac929bf7da6584794756d2b7e4e6556197df40096f9ed0c6f1d740d3eedb3835605fbe3e90557505ca1c5ba8ee10f3959196c8737e53585a600c24a29626e