{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "821468173",
    "entityType": "User",
    "nonce": "0x122d6ada066830f740e4f70074fab37dd6cba6aa00ce9b50702334ea6409d220",
    "signature": "0xa75d9664d96b88973b05bfbda19c3d03ad6cdcc87cb42a5c372562c57d76108535e05db3d23b1fd3af868490be907f1eac6d2b2286e8b9d4565c6fdc64ec10a11b",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}