Extrinsic 20744-1

{
  "heartbeat": {
    "blockNumber": 20743,
    "sessionIndex": 345,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x0c1cd464cf172adcc9abce1c575fc823ddfc5583189bd209815bb4696c00564c86821440904e5b3c928bd99f7206df6ec478544c6953b87e70a162374318a086"
}