Extrinsic 400837-1

{
  "heartbeat": {
    "blockNumber": 400836,
    "sessionIndex": 6680,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x1874675d08711a1513bfc29cb4899e0ae53da54188bb71b0f8065dab4320601019b01ff05a8d64657bcb2cd593ef829bd7d6f43add27cae8c322c8f4c7c0ee89"
}