SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000b6266adeead8aca2c349008942f16ec0c3e7467d489cdae18fbc1763b0f60f3c67c10949a045dfef0b530ace76e7bd47d79e9451e32263d9fab734c6c21b64cd