Quote from: o_e_l_e_o on June 25, 2019, 09:00:21 PM

The total possible number of words to choose from is actually much smaller than that. The BIP39 wordlist I linked to before contains 2048 words. Some 24 word combination of those 2048 words will give you the seed to every bitcoin wallet that has ever or will ever exist. Why the bots don't do that is simply because of how staggeringly large a number that is.

O.K. so I think I'm starting to get it. With BIP39 I can only make my 24 word seed phrase from an existing 2048 word list? For instance, I could not have some of these words be in Spanish, French, or Italian? I did see how complicated it would be for a computer to crack the code with from your example but it seems to me computers are getting smarter every second and they'll eventually will be able to crack BIP39 security. Am I wrong?

I found this information -
Ledger has a position on this: PBKDF2 is an interesting function allowing to derive a low-entropy password into a larger cryptographic key. The lack of entropy is balanced by a CPU intensive derivation function preventing Brute-force.The main problem in BIP39 is that the number of iterations is set to only 2048, which is far lower than the last NIST recommandation (from 2016) which is 10,000. When the mnemonics are well generated and can be kept secret, they represent 256-bits, consequently, the "only" 2048 iterations are not a problem. On wallets where the mnemonics extraction is easy, manufacturers suggest using a passphrase to mitigating the mnemonics extraction threat. In this case, the "only" 2048 iterations become a problem and bruteforce is then possible. If ever, you use a wallet on which mnemonics extraction is possible, my recommandation is to maintain the mnemonics' level of security and using a 256-bit entropy passphrase: 36 random characters passphrase.

Is it possible to get a wallet with a 10,000 wordlist or a 36 word passphrase?

I have another idea for generating a seed phrase. It just bugs me that if someone finds a Billfodl then they will immediately know that it is used to store a seed phrase. Let's go back to my book idea. What if I used the first word at the beginning of each chapter in a random book? If I know which book has my seed phrase it would be safe because no one else would know which book I'm using and it's just one of many in my library. Also, I could even keep the book off premises? Is this a good idea? The problem I see is that the first word in each chapter probably will not be in the BIP39 2048 word list?

Also, I am rethinking the idea of purchasing a safe. If I had a safe in my closet and a burglar broke into my apartment they would automatically know where the Ledger is. Since it is small it may be better to hide the Ledger in a inconspicuous place? It would be much harder for a thief to find. What's better, getting a safe for the Ledger or just hiding the Ledger somewhere?

Also, since my critical information is the seed word, what should I do if someone stole the Ledger? I was thinking since I already bought a back-up Ledger Nano X, it might be better to not back up the second Ledger with the same seed phrase. I could just keep it new in the box and if anyone were to steal my original Ledger with Bitcoin on it I could activate the second Ledger and move my Bitcoin over from the first Ledger to the second Ledger before anyone tries to hack the first Ledger? Is this a good idea?

I know I keep asking questions but you're all so brilliant and I'm very insecure at this point as to how to move forward with this. Everyone is saying I must get my Bitcoin off of Coinbase and I just want to have the most secure method of storing my Bitcoin. Thank you for your continued support.

One more question about this forum? I hope my email is hidden in my profile. I would hate to have a hacker read this thread and have access to my email.