Extrinsic 48-1

{
  "heartbeat": {
    "blockNumber": 47,
    "sessionIndex": 0,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xb4a8c221e50fd9cc873802a18bc3a1d78b8785e639b9bd68322e3dcc6ce75b0d9665692bfd7154fcca4827487bcf51d7393ac12dc3e6a5e25ec3b53012819a88"
}