Extrinsic 20496-1

{
  "heartbeat": {
    "blockNumber": 20495,
    "sessionIndex": 341,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x3819d209a938a815812592bb18022610c4759cacc1ea08c88382b08a6bb6b309353a4a96d37ccd4c162d24d5649c021f66bc83cf765d1319061f4548e672c18d"
}