Extrinsic 20868-1

{
  "heartbeat": {
    "blockNumber": 20867,
    "sessionIndex": 347,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x3089bdfbebe5c72a7e055768fb342f383bbcd6d7ef7334e0b9fe73fbb2ccea254421b0cbd70714a143e5b3e105c55e90946f2e191e16c042b1cebcb213304a86"
}