Extrinsic 174709-1

{
  "heartbeat": {
    "blockNumber": 174707,
    "sessionIndex": 2911,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x3074444415d6d91547e4c85fbc23ce978d7a7411d29c203ec19233fd9cfb500fbba224aacc806e38dab88a0ac05d6a5c9a6624a5fb9ab6db752843fe09adf28f"
}