{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "543549451",
    "entityType": "User",
    "nonce": "0xddfd7cded499b2af380cba93f2f6aa855795752c195a309ea6e497c0eb355b6a",
    "signature": "0xc149194cd82b898ed092eccb227c2e892b75041e51fa1370a6ad6eb63deae74a17a82ae09c29ece08114d59f8a2b9b50a5bc1d757eed94cfb8e977e41a972bc21c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}