Extrinsic 108-1

{
  "heartbeat": {
    "blockNumber": 107,
    "sessionIndex": 1,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x1034529d55cbf051c17938709eab3649bb0c118d463b8765cfa44f94a37c900e73f7bb1075ad6b600c69ce5f7e1adfa329c014ee9f945dc3c5c5393aad749a87"
}