Extrinsic 3493-1

{
  "heartbeat": {
    "blockNumber": 3492,
    "sessionIndex": 58,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x646c85758c7b66ab288f5a2cba1f4e045aef82ce579bf1f866dac64a78e62655b104e331e6252dda3a49f54988d7ef7c0ee20d6dac3d519b5c6b0f49f8a49880"
}