Extrinsic 18248-1

{
  "heartbeat": {
    "blockNumber": 18247,
    "sessionIndex": 304,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x7048e91cf708a02c7c5692faf624c74732940b83e70792b0d787bdc535f1b2733ed3889ffac764a294d82bd6f3adff44f1e89f13a9be6feb436965bf70f6ec87"
}