{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "645720561",
    "entityType": "User",
    "nonce": "0x99e053a559b175cd4da8a6bf7861e90fea851fb7d3856ac507dba46e65cf223a",
    "signature": "0xf74443da2001cb10d8df45ffc2349fcba9806e4036c3e4caa8460939690418b36a45995334e5541250bca3efea96116f62bb928a6daee34a945c906c376439b81b",
    "signer": "0x16D3bf5a80bAfFB2f1550d49b1203D4CA532DA1C",
    "userId": "1994482"
  }
}