Extrinsic 12560-1

{
  "heartbeat": {
    "blockNumber": 12558,
    "sessionIndex": 209,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xea4a9f97b20c1fbb1b895cbbefe8507037259f8f2ab71fb71389669103b91e0f827aa04e78978155954dd2903306793ca4156c4482afcb6d11464d11d2648080"
}