{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "642876820",
    "entityType": "User",
    "nonce": "0x318890d3600b597e8c11af14387fc13cbc27eadbc7995ec297d7be2f190a5c71",
    "signature": "0x521aa632d38bde67f51e37d2505568798c582c2a9fda5845d20b7fbbb55595947924083f43b93d570fce79da8feb53a69471ffc77a7437ccde7dbfccb00f211e1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}