{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x64bfc73c59e6c741cf1a5562c93b21c97b3324a82feb9da586f66ce303716c34",
    "signature": "0x3087a4fc83fd0fd33600097195bbf0d649cc82ad6c673d892efd7f73ee0afe0a7c34ca681909110a47a8d564fde33d92f8469e7bb9a5fa7cb0ce6e80ce45dff81c",
    "signer": "0x9851EA970c7F4f204227aecAACaeDC430944Ca5C",
    "userId": "138990321"
  }
}