Extrinsic 18828-3

{
  "heartbeat": {
    "blockNumber": 18827,
    "sessionIndex": 313,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x3c22d1987c308495f715c23b6530b5a50d83d595bc9b5278e534fcd4f0160333595674f8daf625ceb4659c27a9db10d937ac4f004943fa4c35da3df762941383"
}