SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000b48f239ea311dd20ceca05b08653733a7b81959d22603ab25fd6eadeb345a03548a470994fb1ccf00fedfee31346e0e208913f6ed4e862d959f847a1d45f9faf