SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000c6825eb340e6c8f6ca2f2811e05b1e5e6c85c9749affa126e3f9e5f74e3247e8199ec995a3cc3e28c27e93170ac79d68b2e7b270c8e7eb5c06bea8c1ffdde347