{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "390804",
    "entityType": "User",
    "nonce": "0xc5d40616035a04d4883bb3d6a94b9c2783c8bf5266beec4a7e012f9463e39487",
    "signature": "0xb3dd917190bdcef1e409a0e991a44880e7f0ca1f9a81277b5166f8850c63342b1a0c3b55d7d90ab04f4456baf5946461a2f9530d1a2fa9fb274c84f612be4d291b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}