Extrinsic 21968-1

{
  "heartbeat": {
    "blockNumber": 21967,
    "sessionIndex": 366,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xf81ef349112f79e253a373c22f008c2fed464ff62b371d777e6d73b751e74277080c269533e488392a133895b8825e3bf8053e4c92f7f9a7e3229fa64c672881"
}