Extrinsic 1351-1

{
  "heartbeat": {
    "blockNumber": 1350,
    "sessionIndex": 22,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x5a279a9bdad982f5ba454bab8bc68cc30895639abfdf6b5278a229ff0ea1ba6219ba38d8d3f2b969be59f82aa661e8540ce2bc3923cac39a7507696224687d89"
}