Extrinsic 17975-1

{
  "heartbeat": {
    "blockNumber": 17973,
    "sessionIndex": 299,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x9a8bfb6fbab6611ed3e1c0d49e53cf804806b0d3f097734353cf8ad83e4ba75f2a3a8b915b0c12087927118d67023fed3eb6b7684122479a55d570f7b0dbf48f"
}