SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000a9af5e0177096a38363c80d5241d1028e263e1d6ae57ed9f3300c7ed52ee84a83848e86372e13360bf002112a9490f2cd225999948b0f4c090f81c7b92ecfdf3