Extrinsic 173922-1

{
  "heartbeat": {
    "blockNumber": 173920,
    "sessionIndex": 2898,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x7c58316d7568fbd094eb098fb5d5bbcae09973d5f308e0d19b21242fd7bcc532607b6367829eb12ea57c4b0b2e874c851f8ec65f340b559de50f9a8d07e73481"
}