Extrinsic 3367-1

{
  "heartbeat": {
    "blockNumber": 3366,
    "sessionIndex": 56,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xf8028875b9e3ae2011fba8e02683295535494255f48bea4b9462d1ee620ab56a1f21508ae6e96892fcc1c2de9fbba499168e86e11c575fe7675bec12e14da785"
}