{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x63b1fc66034f80e2edb1ba16b7ae721c556148d7ccf1dbc3e4eb92c7e75e4a6d",
    "signature": "0x426252c3872f14370c197e7a9c1e876f1618c8f98205283b9d112fb9b1f230633dce547c29d48e51b4613c67526b8e7479c1829eaaa9429bd6901510fb539d5b1b",
    "signer": "0x21B491C408293772A3Fd7a2276adB84e8558E7dD",
    "userId": "224044552"
  }
}