Extrinsic 400065-1

{
  "heartbeat": {
    "blockNumber": 400064,
    "sessionIndex": 6667,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x707e370331951a94123efa2caa1c3ab81e68e677395dfa42bb325ab80392220ca6abbfe51402ca08452e56ff7009711bce8a658d5afb6af7e51c4c4e7dd5c38f"
}