Extrinsic 19708-1

{
  "heartbeat": {
    "blockNumber": 19706,
    "sessionIndex": 328,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xd2db2406ee6421bfe643b41b7f254ab00148d99f2bb7de6f22d9a6d3e891f052b83889c638cb2efa4de98fa5b88ffc21d3e463b52367bd96ec938e70fb8ce988"
}