Extrinsic 6489-1

{
  "heartbeat": {
    "blockNumber": 6488,
    "sessionIndex": 108,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x769e122307971fd4372a194da5613fbf1ccb09c6f1ef7f2c074658f226bf7f6c51006ee69f657b9968c29f1b5bd02c0173c4d8b4c85d21fa5611321361905787"
}