Extrinsic 15968-1

{
  "heartbeat": {
    "blockNumber": 15966,
    "sessionIndex": 266,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xc8474d92795cc931c368ba6e3c5cfcf786ee070256eb2dec7c333cb621b83202e8e45095942711bc433ec9e44d16e372029ea57fa95aaf27c61ae5a22b42738e"
}