{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "421774111",
    "entityType": "User",
    "nonce": "0x2bbe6d42bba10f7ed0431ec6786b3b3417b983d61af6970ac2f65711cf29dc91",
    "signature": "0x45fe9ec303f5a6b5dbc4a053beb9bf4709ec7584b84e57f465a94b6f91dc6d0773a89f3decdeb517c6256da26a61ac05f31e24f618a1fdb52a94cf8355e7b4a01c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}