Extrinsic 2922-1

{
  "heartbeat": {
    "blockNumber": 2921,
    "sessionIndex": 48,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xf24011742a6d16fe1d682a3972ff4d7199fa5cf9217bbf6c0b727db07930ca75b0f9bb8cb1099ddd36bd56477af03c932694f9ee2d201ccdae70e13be74d8f84"
}