Extrinsic 624-1

{
  "heartbeat": {
    "blockNumber": 623,
    "sessionIndex": 10,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x7a4d0222b4dbdec840b37c7b97077c0fa3019478cdbc8ae7de9ec2bd4feb4b5c964fa337f8a5b5b9fdb409183a16d466c406b2010e469cea54b948b8c338f68f"
}