Extrinsic 1658-1

{
  "heartbeat": {
    "blockNumber": 1656,
    "sessionIndex": 27,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x109d6c13875cf084bd103ef1dee0ef9293ec020a3a2dd688d1967b80803dbd6465d42c276665efc2a0e3699723a898b64a3fdda590f528f981ffb708fc95ff8f"
}