SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000a2aca095f2e5057d235051155d693dab305e84cdbe1d14ab33a1ae630794b2a57814981be43af6363cd1e8d9529616cd227a18cd19f1955e3cbbdee41076b0af