Extrinsic 3647-1

{
  "heartbeat": {
    "blockNumber": 3645,
    "sessionIndex": 60,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x7ea8865713755c3e325bf9563ccd68ddf9798e55cca10aedc4064bf52f581f7e8ee6003c6e04ca6091de78c7157e9495cdfff907d4cb21f93c0f018922364d81"
}