Extrinsic 21369-1

{
  "heartbeat": {
    "blockNumber": 21368,
    "sessionIndex": 356,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x26a48cab399c6e10ea3cac5b5a0d37321c15b3a13c4aa6defae9186e656ee6259844899d2eda53fe3641df8ffcdc6dac01467827de98e0e48a6508f437012284"
}