Extrinsic 120320-1

{
  "heartbeat": {
    "blockNumber": 120319,
    "sessionIndex": 2005,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x36bbb24e96d873854aba0a10f78f7c9862ae01e288d856e0513ef7c8e9700000d6604cbd4e6b2f04b4bb43cc869ba0394166b80e22956666b21dbec969b6a18c"
}