Extrinsic 1779-1

{
  "heartbeat": {
    "blockNumber": 1777,
    "sessionIndex": 29,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x42d484de3fe19e8b45461489805d08d2c4f0b51041a25f740243c8d8aae45a1c3fe68b4e1480cffc4a0ffa9e35fd7e333ffdbd84a031a0f288ee33d74ea1b18c"
}