SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x000000000000000000000000000000000000000000000000000000000000000203440392972eb166dc8673295d8a13904da6136f6a979f7acd6dbf1eeae82f8a58abdc37d4a0eee0335af2e8a6b105227a7545822f0de01ee585cec99334eb3d