# Brain Wallet -- Memory Based Solutions

A “brain wallet” is the practice of memorizing a seed phrase that is converted into a bitcoin private key. They present a major risk of theft and loss. 

One major problem with brain wallets is a lack of true randomness. Attackers can guess and check many brain wallet seeds quickly in parallel. As of 2016 [researchers reported](https://securityaffairs.co/wordpress/44532/cyber-crime/103k-stolen-brain-wallets-attacks.html) an active community of thieves checking brain wallets for balances and draining them within minutes of creation. 

Brain wallets also present a significant risk of loss. Injuries or just forgetfulness can cause a seed to be lost forever. To be of comparable security as a normal bitcoin key, a brain wallet seed phrase has to contain a large number of words, such as memorizing a 12-word BIP39 seed phrase. If any of the words are missing or remembered out of order, it may be hard or impossible to recover.<br>


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