Extrinsic 4343-1

{
  "heartbeat": {
    "blockNumber": 4342,
    "sessionIndex": 72,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xf0d9fd296005ed1ee85736208c59a9fd137efaa8b0b8ccd74b6db3398f2cf23d3565cc759ab26308700a38ea0ed99260fa29b32a2e41288e526f7aa5bf43ef8c"
}