SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000a260e2888b09408514702163671b09b56c8175a7a31aa021247a65dd9b3867bb85caa4c8c2f9aa99d23408cfc3fba765ef96d827cf2bf0adf7b9e6d97715b556