Extrinsic 19245-1

{
  "heartbeat": {
    "blockNumber": 19244,
    "sessionIndex": 320,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xbeb24d0156120b4cff84f0570a191af2e23e3a2dbc97780e375d1ac2ed2bc44cf4e8601ba11d1412fb04c14e765644d78fd3e66b31a00c2f2edb20f784ad1c8c"
}