{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "2554",
    "entityType": "User",
    "nonce": "0x19387c2f2fb91bc6f26abd3f3be80754e14a930eadd3e46cf96f2d2d41623c69",
    "signature": "0x3b52a23f2e91b7e7381a23405d336a9c32b817d0fa694ece9099831531853ee07a92298674ab535cd3057ec104aa107b0682ed6a9271f4509038c0c21fa6812f1b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}