Extrinsic 8263-1

{
  "heartbeat": {
    "blockNumber": 8261,
    "sessionIndex": 137,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x4257abe8be84bce849f555042dca86fdac24df5c8722954226359f34d4c9a81f1a65bb9920af70ad62c77a67ea1fe63fb094d054298a329a0c715aca2bda358a"
}