{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "257600804",
    "entityType": "User",
    "nonce": "0x446ff281118d603104c0018380668b1f3e0b6e3343c66bf393b95f209456b161",
    "signature": "0xd7b963568d966224c49832119c8206f3673224ab64a5e273189c60f9c813db7b41b2ca43c6bec4be6c2199db757e80894aa8ac0db73f6a05c76b8f806a2cd9491c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}