Extrinsic 21370-1

{
  "heartbeat": {
    "blockNumber": 21369,
    "sessionIndex": 356,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x026ba385f348850ef9cd41f7f2a1f4ddc8e676490b35fa580160991b798ef518204a2a5123d01972c217b519580d44f980d867e9e732c2ea88722408dc3bbe8b"
}