Extrinsic 16661-1

{
  "heartbeat": {
    "blockNumber": 16659,
    "sessionIndex": 277,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xa8533c46b2bc7e0502a72e63f74e1ecebdbc73f04209b2edde0a585cf14c19207c2af8f03a6a06b8e9f11f34db8ce0809eaf363bfba77aedbaa5a1004a840c8f"
}