Extrinsic 19208-1

{
  "heartbeat": {
    "blockNumber": 19206,
    "sessionIndex": 320,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x662f97e619634d84c9d9e11137bbe17e59ca14b71d91232e44642efd369ad16154f2449ce7cc5e6f61c86741723fc7b6f1990b9a640252c496341c019d68b88b"
}