{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "304857543",
    "entityType": "User",
    "nonce": "0x4acf7e47464d967f5e815b9500e98c3b0fc4961ea9ff650e5d47a9a51943ab60",
    "signature": "0xea99af3b3a8c4616e64a08ad26c281fab572f5b1f9e70ce0bb2e60e9636cb9370bd87eda4bff78f3710b849ebc82a6c44ec242b0c8810766f9eb3ce0c0dbec821c",
    "signer": "0x40E8E224E8F8a9f835e4dc8851Da72DCEd75986F",
    "userId": "504092010"
  }
}