Extrinsic 3289-1

{
  "heartbeat": {
    "blockNumber": 3287,
    "sessionIndex": 54,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x1cf7dcbfc19e25f119d4e509065d8dea2bb49640748caf34c8e18bd4d6f08d4fe5fe041804441e5d4955789f551175dc0e86fe948a951a61f74b6c4960194589"
}