SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x00000000000000000000000000000000000000000000000000000000000000007c39739e7c408f4cdeed9a38d050ea94f3633ed1bb6ae4337ab70e6d8f29734b4d9017a25625f01205997e2eb18594229fdd51799374af4182ff458299e3e5c2