{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "600125181",
    "entityType": "User",
    "nonce": "0x479a68b3d09f4e0393054637940812544d9e0d45eef9bad55ca2fc4639089650",
    "signature": "0x8d814f9c9e53971b1463f4f7add05c177b1d4c6d5f47b609c0b8ffb070f16ba70c62b3245cfcad5a7db0eda9b267b35f1aaf8bcc430857f30a2cc3caaac38f391b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}