Extrinsic 1728-1

{
  "heartbeat": {
    "blockNumber": 1727,
    "sessionIndex": 28,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x788c4ab0e9e1974d78bdd5e69ca6b7796bd4915a8975d0d24a0c9b5c9a64057b1148fdf3e4d92702d21cf57e7a49c03889a90ddac658a5b251b3f18655f5138b"
}