SigningKeyAdded (index_topic_1address account, uint8 keySlot, bytes32[2] key)
[topic 0]:0x1d84cb7fa5da6303adc54870a915cbf91d2cf642fcc5ce470b79b77467201876
0x0000000000000000000000000000000000000000000000000000000000000000a9d470f7151a52a1b4fe3d9924ee45b2ef3c5893e956a6ca95751555268103f48b5d9cce4f460749ca4fb993025e0ff6ada61c46a853796a507e049f49eabc0e