Extrinsic 12878-1

{
  "heartbeat": {
    "blockNumber": 12877,
    "sessionIndex": 214,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xec31ec730eeeebdca754b54e587adb0ff40346ba6984c7812f3b47a470c9d66c85942439041fbe41daa3a21d29affc7ce9de528f59da9c4a950e931d3f11b182"
}