什么是比特币脑钱包、纸钱包？
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脑钱包与纸钱包其实不算是钱包的分类，只是生成、存储密钥的方式而已。脑钱包属于迷你私钥的产物。脑钱包就是记在脑袋里的密钥，纸钱包就是打印到纸上的密钥，仅此而已。
有同学提到过，以一个计算机文件作为输入，例如一个数MB大小的照片，通过某种Hash运算后得到私钥的方法。还有朋友提到用
blockchain的数据库的其中一小串数字来当脑钱包的密语
，这些方案的安全性还是不错的，同时可以防止盗私钥木马根据特征扫描私钥。文本形式存储私钥是有特征的，而一个照片文件却难以察觉，即使放在云盘等第三方存储空间中都是安全的。
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