SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x000000000000000000000000000000000000000000000000000000000000000077960cba362d5e344eebe8c5de9c241af02257d9ef277dc0ab4032ca516c40c124d2a5f4851698d70b4541064deacdc57bba686014dfaab6ab14e7f31f8f5011