Extrinsic 4225-1

{
  "heartbeat": {
    "blockNumber": 4224,
    "sessionIndex": 70,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x845e0fc216300491982736035651296012b487a7e297cdae4ad3a1cdb93b423eb2fbd84e228d5f29cf60d75c08c7fb0c5a0b3fcf35ae44ccff477f1ae71a658b"
}