Extrinsic 8477-1

{
  "heartbeat": {
    "blockNumber": 8476,
    "sessionIndex": 141,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xd44ddd8f9e1d3c7fe416c5dd0e29afa35b3dceca5b9e37c1c5ebb0625e03697dd708dc4d7f55526869a73c6d6e2ed4f658071298203c489c568aa5f43b37808e"
}