SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000f4775f27e42e6daca4b54e764e52364c900453e57e61b5c80f0da3bf2ef8317a776cd35dcfc66dcc127687c89b6bb82f40482b60a7173b233a597910e8dc1af9