Extrinsic 21346-1

{
  "heartbeat": {
    "blockNumber": 21345,
    "sessionIndex": 355,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x94ee924e789500ea4180f3b0e8d9fdc65f6e7914dccd188d1440b62a5b44ea073953683899bdb6c23ced74db1cc854dae09d3fbf04ebcc902a38627a701b1e8a"
}