SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000a431b7a28e1ea9f117af3486586b9ea2008ac2d2e1c3614f08d04e4c7b6adbbd06f8e256f3b049da92eb11c591186b254e9cf2fe209df1c5691d094f5eef28f7