Extrinsic 1243-1

{
  "heartbeat": {
    "blockNumber": 1241,
    "sessionIndex": 20,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xc8987f40688bb5a53ada4085cf3bed53754e4704213fd216bcfa9036438f416f24c31226e0c6da491a136c50c79596254c2330a03e8b875fb79105b371c7df8f"
}