SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x000000000000000000000000000000000000000000000000000000000000000250bbb761c2cf218f1f8971ef9d28ff6fc9faa97258354addeb004a708b9e03846de70968bd55b2faff6d5a7b8a484bd4e962f93bba72e667a45a5667ef3e6995