SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x00000000000000000000000000000000000000000000000000000000000000004d5c8ca09811af6697ead59fc13cbc931c329b190312f01eaf9ebcf1f41416e0925149a146fb5b3a2269c78a2dbf8ece5f128044628cd4f9d6cfbbb71f4c458d