Extrinsic 6745-1

{
  "heartbeat": {
    "blockNumber": 6744,
    "sessionIndex": 112,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x7a9b2f551a9fb0cac117493d650a5521a257e32a93f7e923a915f5e5086429410cfb22d23b508bc151513af376b49041a12a16891a1be4f69ab324d353546b82"
}