{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "643532828",
    "entityType": "User",
    "nonce": "0x3001ed721994d7113b6dd4e5951cd4b4492454f7b07e12951462391963b7ad90",
    "signature": "0x769a5583e9a63bf0522ceb3238a944ceae716b16e2755988f81b1f89fe88629f4e6ec16d5979906aa6ecd373861c017f7cba3ca69ebe416063f311c624de77891c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}