SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000b66bf2967a985a3acca7e51c2a71d555dc2421c8d757b4d0e2499c10cb6857775c2eb209ecad7ebae5f982120b8ebe7e56d0b4db88cbb18dfcd9e9b2085423e7