The OP posted this on stackexchange too: https://bitcoin.stackexchange.com/questions/78813/same-seed-from-electrum-but-generate-different-bitcoin-addresses

Ultimately you are going to have to use a computer to create a wallet for you so why not simply create an Electrum wallet and use dice generated entropy as custom words? Electrum lets you do that. In the step where you are displayed the seed you click on options and check 'extend this seed with custom words'. In the next step you get the option to add your custom words/characters. The Electrum seed is not BIP39 however.

The bip39 standard also supports passphrases which work like the seed extension feature of electrum so if you prefer some other wallet software check whether it has this feature.

In both bip39 and electrum the custom words/passphrase are used as salt in the key derivation function used to convert the mnemonic to the wallet seed. Different passphrase results in a different wallet.

Core should be keeping track of all addresses including p2pkh ones. If it isn't you can always dump the private key and import it into another wallet like electrum.

edit: AFAICT the uncompressed p2pkh address of the public key of 32Z3eXSPgxcHj2fnQy8d6dg66eVtZfxrBM is 1GY6bTT89Vw4DAzKsJ43g2CoDzDpE8JxKx so it turns out that the private key for 32Z.. does not unlock the outputs sent to 1s2iywx94HudryMHsU2g1K9x8DB1cahGc . So you need to find out which pubkey was used

Note scriptPubKey is not the same as public key.

I wrote a script to convert between the various key types using the electrum libraries. If you install electrum and python3 you can use it: http://termbin.com/jm3l

The menu in macosx is at the very top of the screen not in the application window. Look at the top left. wallet menu > private key > export will let you export the private keys but like pooya87 said backing up the seed is a better idea.

edit: I see your problem is solved in the other thread. please close this thread. if you edit your original post you'll get the option to close the thread at the bottom of the editor.

Yes as long as he moves his bitcoin to a new seed/extended seed and does not use the mnemonic in altcoin wallets he'll be fine. He says above that he'll use individual address private keys to claim altcoins.

Creating different wallets from the same seed is actually the reason why seed extension support was added to electrum in the first place. However, you have to keep the seed secure. Don't expose it to some website or altcoin wallet. The seed extension can be as simple as 1,2,3 etc. I don't recommend an over complicated seed extension because you are likely to forget that and lose funds that way. So keep it simple and it'll be fine for the usecase you mentioned before:

mnemonic_encode/decode are just used as a sanity check in the make_seed function: https://github.com/spesmilo/electrum/blob/master/electrum/mnemonic.py#L159

It is better if you move your bitcoins first before you go claiming shitcoins with the same private keys. This way your bitcoins are not at risk.

See number 3 here

This is similar to the question here:  https://bitcointalk.org/index.php?topic=4952844.msg44677337#msg44677337

The conversion of mnemonic > seed > xprv involves hashing at each step so you can't go from xprv to mnemonic. An attacker would still have to repeat the hashing process for each seed and compare the resulting xprv. Also why would an attacker do this? It's not likely any user is going to reuse the same mnemonic.

Regarding option A do you intend to use a custom word aka seed extension or just add a word to the end of the seed? You can't do the latter because the seed's checksum will not validate. If you do the former then the seed extension gets used as salt in the mnemonic > seed hash function.

I would just go with option b just because it's guaranteed to be safe.

It can't be done. mnemonic -> seed -> xprv is the order of things. mnemonic > seed involves hash functions and the extension is used as a salt to that so it isn't possible to go from seed > mnemonic. in your case you don't even have the binary seed or the xprv. you have the xpub and reversing that to get the xprv would require breaking ecdsa as well.

I own bitcoinelectrum.com. I wrote that article.

That's an electrum seed being used as convenient source of entropy for the generation of a p2sh segwit wallet because electrum doesn't support those out of the box. When creating the wallet you tell electrum that the seed is bip39 which is what gives you the option to set the derivation path in the next step. It is however not really a bip39 seed mnemonic.

It all depends on what wallet software you use to eventually spend those coins. Also whether you import the private key or sweep it.

My suggestion is to not use paper wallets at all. Use a deterministic software wallet like electrum.

Any thing that you can code with the bitcoin script language can be turned into a p2sh address. Smart contracts and such for example. However no wallet supports such solutions out of the box right now so while it's possible it's out of the reach of lay persons.

there is no such thing as an electrum default wallet. where did you download electrum from? check your browser history and tell us.

The seed in question is not a bip39 seed but an electrum one. No one is claiming cross wallet compatibility and you can't rely on that.

To add to the above to use it as a bip39 seed you have to turn off checksum checking and that also means that typos in seed entry/seed notation can go unchecked. Then there's the question of the derivation path. You have to note that down too. So overall if you make a copy of the wallet file it'll contain everything that electrum needs to know to recreate your wallet and you don't have to rely on an human's getting it right.

This was answered on reddit by a developer: https://www.reddit.com/r/Electrum/comments/96qpn7/electrum_and_322_and_electrumltc3131_do_not_run/e42kd2s/

you will forget those steps 2 years from now unless you note them down in explicit detail on the same paper where you wrote down the seed. also 2 years from now electrum's UI may have changed a lot so the instructions won't make sense. hence the warning not to rely on seed backup and just make a copy of the wallet file.

Lack of competition is the reason. Few people in Pakistan are interested in trading bitcoin. Another reason is that bitcoin is volatile and the few percentage points of margin they have can easily be blown away by a quick pump or slide in the price. In localbitcoins to post an "online ad" (as opposed to an in-person cash ad) you have to store bitcoins in your localbitcoins wallet so you are affected by the volatile price of bitcoin. I imagine these guys selling bitcoin "online" short it on an exchange simultaneously to protect themselves from the downside.

The other problem is that the SBP has barred banks from processing payments for bitcoin so you can't fund your account at an international exchange via bank wire transfer. Buying via credit card is also not possible for the same reason (it would be risky IMO). Besides they recently added a 3% tax on all foreign currency credit/debit card transactions. So there are few alternatives to OTC sites like localbitcoins.

have you tried restoring in electron cash? you are not tied to copay you know? no need to share  seeds