{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "21640",
    "entityType": "User",
    "nonce": "0xe8040908b667b203480af967e863b83c7217f80137983df1f7c477be56f121ed",
    "signature": "0xab36fd718d188b6821f8513f1e5c5bd34be0b793cde669c58142abac6af3b30c1668b1857fb4d4da17734dffe4ca6a01872267a5fd4765eba68305fc30d0258b1b",
    "signer": "0x21ADB7f97E1a46192A5d3230E20306b7b899bEBA",
    "userId": "305884662"
  }
}