Extrinsic 28539-1

{
  "heartbeat": {
    "blockNumber": 28538,
    "sessionIndex": 475,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x4e13b77ac3e2d68c526660bded092d859d43081a96f77502b38484f19e718d580254d97752ec9b499ddd48177bee67340b4a44cf90bcc2151d45970bfdb3a78a"
}