Extrinsic 20728-1

{
  "heartbeat": {
    "blockNumber": 20726,
    "sessionIndex": 345,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xa274526dcbe3188e35353c1385fa21cb43c57d0bd2afe097f2e9fbefccb0193cb6e31cceed4823fdc6df5856bb30477c989e889960114ed9e25813f567bf6f88"
}