Extrinsic 15166-1

{
  "heartbeat": {
    "blockNumber": 15164,
    "sessionIndex": 252,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x601d907c5fdf0717c6960121d0fbcd24e64de030e82682b6a9ea642686de0b16c0b9abcc95ac12e8f93bf3d0d08078b97280b7e95ac984d053eec44d3988dc82"
}