# Keystone Tablet 為什麼每個空格只能放入四個字符塊？

Keystone Tablet 附帶 252 個字符塊，用戶可以很方便的將字塊組合成助記詞存入 Keystone Tablet 內。Keystone Tablet 內部正反兩面都可以使用，可存入 12、18 或 24 個助記詞。

用戶只需花幾分鐘，保存最多 96 個字母，即可確保您的資訊隱私及安全。

**為什麼每個空格只能放入 4 個字符塊?**

Keystone 錢包遵循[ BIP39](https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki) 協議的助記詞生成規則，助記詞庫包含特定的[ 2048 個單詞](https://github.com/bitcoin/bips/blob/master/bip-0039/english.txt)，每 3-4 個字母就可以鎖定詞庫中的一個單詞。輸入助記詞時，Keystone 錢包可根據用戶的輸入進行檢索，您最多輸入 4 個字母時，Keystone 錢包就會鎖定正確的單詞並跳轉至下個單詞的輸入框。所以，您可根據單詞長度，每個空格僅放入 3-4 個字元塊即可。

如果遇到3個字母的助記詞，可以用字母塊的空白面（反面）填充。

如下圖所示：

![](/files/-MkW2sjQj5TkOyjxxCPP)

完整助記詞庫，請點擊[此處](https://github.com/bitcoin/bips/blob/master/bip-0039/english.txt)查看。


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