SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000e87b61c4c386a4680a999b5df071fbb5864646d233649a9252fdd1eb6386671ef9c708a33451b5fca0a249ae16d5880f68b281d01bfba0f2393e131f69897b9d