SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000c98863c12a6675d0d6ffc85901706ee6e79542ee5ec7f58265f633c3b2bef8d6e41cbdf1baa4ae3a57e89f8cc4214337b8a14ff647e2b01bd89dbdab142ee050