{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "607647194",
    "entityType": "User",
    "nonce": "0xa6db8ecbf0ed0f87c98e3ee121781916ed6bc549fdcfad1e8c4120c8bf75eeb8",
    "signature": "0xdef51a09504aaf2c0e1ca1a5911135cc589ff639e72ae501468fb2f0d55bf4604cbfef5e40ce0ae96b86337b76c57d9b630a3a8a7032ae223afe81abf0cc3a4e1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}