{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "121215",
    "entityType": "User",
    "nonce": "0x1b75275fc56f45b493f920e5f91f3a1d401c9808c57b4f7a240439b6b26856ae",
    "signature": "0x2814c54542000adaaa5e38fcb75f7f0503c439e90c258ab7aa5cf296a8517e573cdfe6b21de8dbc79d5bb77b1f0ec6c16eaf201aacaf2a58d8937581440630351b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}