SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000399b3a8ef88774253d036cc7e22cc3351ad19e3f0c05de6a93e606959fecdf3afe6ee631e6d7d371f36ba98d14f1cd9c34bf270fe0d6422b7bbe8edb92ad2a95