Extrinsic 173439-1

{
  "heartbeat": {
    "blockNumber": 173438,
    "sessionIndex": 2890,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xb8aef9e7615e4ab9098fe8e84932bca7df1f90918355e4d19ca7eb2ada38817b452687ef494a2dda9173e8ccc6961c90d6292c6e12bd9006e0e2e754643f6584"
}