Extrinsic 20558-1

{
  "heartbeat": {
    "blockNumber": 20556,
    "sessionIndex": 342,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xa0210ab8a613ae53322fa33a950f786cf2339aed9b4257a3b492bc40d5b4135c8630c44adc315fe85d8414d81e3ba613663f8272da98183888e74c529c4dfd89"
}