Extrinsic 17554-1

{
  "heartbeat": {
    "blockNumber": 17553,
    "sessionIndex": 292,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x84b12509e05b9e36864c7de2751ffb619a59b39e5dd34db6750b7de0ee8ffe527ca29753d4ad8e2bf773b81234f549bd06d019a7d7ed56c8910da484eda8ce8b"
}