{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0xf53d43e5986abc1f10ad81bd38dd681599392de41f293f7a146cb9105f539eb4",
    "signature": "0x6151759c33957952dc14888d4fa58b5c65a4360e2c7fd99200b8c9e054e47bf85891cb32cdf31efc886a756dfe8b3eba03ea0125b985ac5c5bec89b65bd4cc421b",
    "signer": "0x990F2c91Bb2F5E5014BcD365320De09c44E1e1E5",
    "userId": "989231579"
  }
}