SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x00000000000000000000000000000000000000000000000000000000000000004ffb3c380aa2ec4b77d54bdb2eda00fef5b7dbc2a96d59182981befbc9cbf14bc890fbed8ad9790d0d93315e6555ef5690b6005b7798dea8a141c4a2ef8fcb36