SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000980b945861058c1c6910c1e36e62c934d9cbe73415f831f2db18850848f3383773c05762ef8ebdeb7867c6158520b7eece02be5e931c10a826ed1b3f97d118c9