{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x893bf7839c61c829653db6606bc80c15a88a13739a652eb550d241ccae28445f",
    "signature": "0x6d651f092f482686719698f500e4fcefec1bce49e3c733ef70f98fa5a13eddd84f629e6c38232e66c8ede5770b4d8944441cee6f1cdae428a24bbbee0041f2a21b",
    "signer": "0x50C4DB9f7dfA5477c064525B699bD847c717484b",
    "userId": "18590210"
  }
}