Extrinsic 18886-1

{
  "heartbeat": {
    "blockNumber": 18885,
    "sessionIndex": 314,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x4ea140dda7f03b69323163a9288df33e415e105d90bdcf760e421ed82f5b2021bb9b4395c1f126645d6575e0bdb8a7d7910f3a640c7b2f1bee0e7d50abc4b38f"
}