Extrinsic 6550-1

{
  "heartbeat": {
    "blockNumber": 6549,
    "sessionIndex": 109,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xfc5f454d0074f0f8f9113b939099e8ce5fbc55dbb1c92f8a8aa36a47796a653fe0a3cca3e119ad1f83a6bf78d498663d6b4bde70c21d486007ca2ca09bade48e"
}