SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000001faa88dd3a06cda3000b947ccc1039082c0d88312e792e0177cf72224ec7eff537ac6dd71e3818878e363bcd061a9dcd3f42c7eae8e8acac4f0f04ef10f0820bf