Extrinsic 15343-1

{
  "heartbeat": {
    "blockNumber": 15341,
    "sessionIndex": 255,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x4223ce548c1ec5159b86fc57e932a76c89935c0ecaaa1468f183905482cb191bdf0d6492fa988133361ac7a50e128ec59743667028dca9ab618c503863c22b86"
}