Extrinsic 4327-1

{
  "heartbeat": {
    "blockNumber": 4325,
    "sessionIndex": 72,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x2e02d6ebad05cd211d28484cfa5018273bfc167ea86a88905cf68cd0cc25993f521e10f6d10f319665921c3693413993a31fbae73afbbab31fe13f62851e0c87"
}