Extrinsic 19238-1

{
  "heartbeat": {
    "blockNumber": 19237,
    "sessionIndex": 320,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x78f6d1f8bb241a554f6edca3001057aa34efa5f6e4eab1674e1cd27ed1736c1fe7beb99cf460e5cfaa9a2ff21c09527e06201337bc0193b3c9ed2abcb5f44c87"
}