Extrinsic 6254-1

{
  "heartbeat": {
    "blockNumber": 6252,
    "sessionIndex": 104,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x82a60ffb67801d7332e8416f26309b16af3095fdf1ebfcbd03a66313e6eb3a63e06a0a4de67d44cbca537c12ec2b1f19ff48a1560acfed9383631282fc2f1e83"
}