SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000d8fb7ba948bea531b6fd995e74058cedfe16dbcfaf336aef6e40880092a03061fb378e30b22569dca8b4f89cf590ebc72f4829cff346a30d2e31e0a9e6056f48