The truth is that I never made such a claim . My claim was that you cannot recover a wallet from its password which is technically impossible and that is something that anybody using Bitcoin knows or should know , novice or otherwise , you need the private key . Of course , if you create the private key from something that ' s easier to remember you can with less effort recreate the private keys , I never said anything against that because it ' s completely true and as Deathspiral 222 said you could easily come up with another system where the input seed is of a different format . This doesn ' t even have anything to do with Bitcoin but is a feature of how pseudorandom number generators PNRGs work . A PNRG always produces the same stream of pseudorandom numbers for identical seeds . I did say that it ' s hard to remember a raw private key but said it can be done . I do acknowledge that deterministic wallets are a solution to this problem , but I didn ' t question the ability to recover wallets in the first place .