Extrinsic 3342-1

{
  "heartbeat": {
    "blockNumber": 3341,
    "sessionIndex": 55,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xa4362dbdcbcbdabc9b2d3fe51ff2d98eeab9e8bc14f3961afcc22003b2de8a25f26b051236c5806ab95c1434149c1fb1a056a4eb286239e95666f86ef82bbd85"
}