SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000148569f013773131ccb6c2d4646728ba18c40835331a88c05afa971283432515f1c8b6198be5a9eb636293eaf3902b76c24c1a8bc8d932ab9e3ce9d4b4c818c4