Extrinsic 40421-1

{
  "heartbeat": {
    "blockNumber": 40419,
    "sessionIndex": 673,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xa0981c729ddd3e79f30443e5fca8b2bc4a58542518a1ac810dcea0fd7471a21704da787aa0e4a4023128ab85c715953b10fcb5ccec8824a13e5453fc3bff1c84"
}