SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000b290cde1974c18a4ade52a71356ef1b0a461f80be7f21c7d8066c84ff69a3b54e0f2eabb32f1407562cf2c0757733a2342ffab5bfedda703dca0af1826c20364