SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000a23571cdd962088648430ad3b6bca7376020784c90deb73fb76d7659735135f6915619d3adbeacc83dc8256d7cb064af70b004b563dbcf23b8dd0e789cb6ebd8