Extrinsic 21742-1

{
  "heartbeat": {
    "blockNumber": 21740,
    "sessionIndex": 362,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x6ebcc01a9ef5e85ee33ad57343a667366e430a47eda04bb519dbc30d3f9bee27e5889d43c951cadab32ccb1d95956e263c42039eda7f9dba4f0d63743e34db8c"
}