SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x00000000000000000000000000000000000000000000000000000000000000001540af8d551dc35a28f6d5bba2e42ca0e41ebc220a22fd441d38c56c7adb4f1d28672a0a3f2c4777e4729f2e0d4c2d81b137ed0f6947287c3e783da17bacd928