Bitcoin Forum
October 20, 2018, 01:31:15 AM *
News: Make sure you are not using versions of Bitcoin Core other than 0.17.0 [Torrent], 0.16.3, 0.15.2, or 0.14.3. More info.
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1  Bitcoin / Electrum / Re: Cannot Save Unsigned Tx on: October 12, 2018, 10:51:46 PM
Thanks for all the replies. The only reason I haven't upgraded the offline machine is it's an older netbook running XP so I figured it wouldn't be compatible with newer versions.  Guess it's time to get something newer.
You are correct that you're likely to encounter issues running newer versions of Electrum on Windows XP... the updated Python version used since Electrum 3.x does not play nicely with older versions of Windows Undecided

As jackg suggested, you may want to consider moving to a Linux distro if your computer is not able to handle an update to Windows 10.
2  Bitcoin / Electrum / Re: Use custom words (seed extension) on: October 12, 2018, 10:48:46 PM
- There are other Electrum apps for LTC, BCash, Dash. As said above, I could use my main seed in these apps as well, just being sure to create new Custom words for each wallet/apps. Is it safe to do so, considering I take the normal safety measures (not exposing the seed online, etc)? That way is a very convenient way to have many wallets for these coins, without creating new seeds everytime.

no because first of all you will be doing Address reuse which is something you should try to avoid.
How can you be reusing addresses by using the same seed in other versions of Electrum for other coins? Huh Especially, if adding different seed extensions?

As far as I'm aware, all the various forks of Electrum utilise the appropriate derivation paths for their specific coin... so aside from the fact that most coins (BCH excepted) use and generate completely different address formats... the actual underlying hex values generated will be completely different, even if you were to use an identical seed/custom extension. Huh

The only time that wouldn't happen, is for an exceptional cash like BCH, where they were (originally) trying to be "bitcoin" and created identical addresses (and a boatload of confusion Tongue)
3  Bitcoin / Alternative clients / Re: [PSA] - Price drop on Trezor One (+ developments) 2018-09-21 on: October 12, 2018, 10:40:02 PM
It isn't so much that you need the cable for communication... it's required for POWER! The device does not have an inbuilt battery Tongue

Theoretically, I think you could even set one up using a USB powerbank if you really wanted to ensure that there was zero communication happening. (Don't quote me on that, as I don't own the T, only the Trezor ONE which requires the use of the computer to setup pins/seeds etc)
4  Bitcoin / Alternative clients / Re: Currently Best Means of Offline Storage? on: October 12, 2018, 10:36:24 PM
There isn't really a "one-size fits all, best" solution for this... As with most things, you need to figure out what your specific requirements are.

For some people, "paper" wallets make the most sense. They don't want the expense of hardware wallets, are comfortable with the processes for securely creating/redeeming them, and safely storing them.

For others, who also want the ability to be able to spend coins occasionally, but still want secure storage and don't mind a little bit of extra cost, (or maybe are involved with multiple currencies) hardware wallets can be a great solution.

My advice is to specify your requirements, then find the solution that matches those requirements... asking "what is the best way to store cryptocurrencies?" will just result in 65326 different opinions on what is the best method! Tongue Most of which probably don't apply to your specific requirements.
5  Bitcoin / Alternative clients / Re: Nano Ledger S Ledger Live? on: October 12, 2018, 10:26:46 PM
hi there.  So you recommend me to update the ledger live now correct?  Also do i need my nano ledger s connected to my laptop for this process right?
You're not really "updating" Ledger Live... you are installing it. It is a completely separate app to the old Chrome web browser extension. Ledger Live is a native desktop app available for Windows/OSX/Linux.

Hi there.  When you say make sure you are on the latest version, u mean my firmware on the ledger nano s?  I did a firmware update month ago though.  So if you connect nano ledger s and it doesn't ask you for firmware update, you are fine?  

So when i go to the site now to download ledger live, do i need the nano ledger s connected to my computer?
Not to download it... it is just an app like any other app for your computer.

You don't need to have it connected to update the ledger live app or view the balances of the supported coins.  Im confused what you mean by this.  You mean it shows your cryptocurrency balances when your nano ledger is not connected to your laptop?  That doesn't make any sense unless im interpreting it wrong?
For the initial setup, you need to have the Nano S available so it can read your "xpub" and find all your addresses and balances. After that, you can actually open the app and view your portfolio without having the Nano S connected (essentially it acts as a "watching-only" wallet, protected by a password)... If you want to do any "secure" activity, ie. send transactions etc, you need to have the Nano S connected to be able to sign transactions etc.
6  Bitcoin / Alternative clients / Re: Samourai wallet drops fiat equivalent balances. Bold step or gimmick? on: October 05, 2018, 10:21:30 PM
That's understandable, but they should use BTC/satoshi as default unit and have option to enable fiat equivalent beside BTC/satoshi unit.
I agree. I'm all for choice... It should be a configurable option. They can always set it to off by default, but in my opinion, the user should be able to set this.

No one would use wallet if it's not on final version, too much risks involved. Besides it's not available on Google Play where most people download their wallet from.
But that's where I can see it... I can't find a setting in Google Play to switch this on/off (unreleased apps etc), so it's either buried in the desktop Google Play Store settings or perhaps it's only visible in certain markets. Huh

7  Bitcoin / Development & Technical Discussion / Re: Signing a sum of bitcoin on: October 05, 2018, 10:02:58 PM
This BIP seems like it might be addressing this general scenario amongst several others:

However, it seems that it will still "expose" all the UTXOs required to make up the sum, as opposed to just proving a sum total.
8  Bitcoin / Development & Technical Discussion / Re: bitcoin wallet master key on: October 05, 2018, 08:59:30 PM
With regards to Bitcoin Core... The "proper" method of backup is a copy of your wallet.dat (or even multiple redundant copies)

With the Bitcoin Core HD wallets, every time you change the wallet passphrase (including the first time you set one up), a new seed (and therefore new master private key) is created... And new addresses derived.

NOTE: All the old master keys/generated addresses are still stored in the wallet file.

So, every time you set/change the passphrase you need to make a new backup of your wallet.dat.

Or, do it the "hard way" and try and keep track of all the xprvs Tongue
9  Bitcoin / Development & Technical Discussion / Re: "Purpose: ProveFunds" bip-0322 on: October 05, 2018, 08:50:51 PM
Would this function be for exchanges and large funds? I found it rather confusing. Could it serve to prove the funds that my account in the exchange says to have?
I would say, no. Firstly, you wouldn't have the keys necessary to sign... Only the exchange would.

Also, "ProveFunds" will not return valid if the funds have since been spent. Most exchanges tend to consolidate inputs that were deposited. So, this method will likely return SPENT as the UTXO won't exist any more.

Additionally, it looks like the auditor would need to have a Blockchain synced to a specific block to verify each proof... which would be a time consuming process if you're trying to prove several transactions across different blocks.
10  Bitcoin / Bitcoin Technical Support / Re: Transfer status Local on: October 05, 2018, 08:28:06 PM
Aside from "transaction rejected"... Does the error message say anything else?

Usually, it will have an error code/number and a somewhat cryptic message. For example, "66-insufficent priority"

It's been a while since I had issues with the Android version of Electrum, so I'm not 100% that it shows the full error message... However, if it does, knowing this number and message will greatly assist with pinpointing the root cause of your problem.

Screenshot maybe?
11  Bitcoin / Bitcoin Technical Support / Re: trouble syncing new install? on: October 05, 2018, 08:17:11 PM
It could quite possibly be an issue caused by attempting to use an external disk (via USB) from a VM.

Additionally, 3gig is a relatively low amount of memory... And 2 cores from what I assume is a 4 core processor? Huh

You're basically kneecapping your setup in every conceivable way... Low ram, low cpu, low speed HDD, low speed interface to HDD and then doing it all via a VM!!?!  Shocked

Is there any chance you can try it with a more "direct" approach? Perhaps an Ubuntu live USB setup? That might at least help you eliminate the VM (and low ram/cpu) as the source of your issues.
12  Alternate cryptocurrencies / Altcoin Discussion / Re: ZelCore wallet on: October 05, 2018, 08:06:51 PM
Interesting concept... Any idea whereabouts "on the blockchain" this data is being stored? Presumably, using OP_RETURN (if BTC)... So who pays for that transaction?

Which also begs the question, given that Zelcore is multicurrency, which blockchain is it storing the data on? Huh
13  Bitcoin / Alternative clients / Re: Samourai wallet drops fiat equivalent balances. Bold step or gimmick? on: October 05, 2018, 05:00:18 AM
Did they change Samurai so that it shows more than 25 transactions? Last time I used it, it was impossible to see the full transaction history of a wallet...

That would be more important to me than seeing my balance in some arbitrary fiat amount.
14  Alternate cryptocurrencies / Altcoin Discussion / Re: ZelCore wallet on: October 05, 2018, 04:54:28 AM
Bob123 has a valid point...

The main "security" of Bitcoin private keys and seeds comes from a good source of entropy. History has shown that humans picking passwords generally results in very low entropy.

However, there are ways around this issue. For instance, the method that "Warp Wallet" uses... As long as a sufficient number of iterations of a sufficiently "slow" algorithm (script in the case of Warp Wallet) are used, it's possible to prevent brute forcing (or at least make it VERY time consuming)...

They had a challenge that used a password of just 8 alphanumerics and a salt of "a@b.c"... Prize was 20 BTC (when BTC was ~$10K)... It went unsolved.  Shocked

However, without being able to see the source code for Zelcore, we have no way of knowing the algorithm used for getting from username+password ---> privkey
15  Bitcoin / Mycelium / Re: are funds automatically sent to my newest address / fees on: October 05, 2018, 04:35:32 AM
Seems like OP does not have a solid understanding of some of the Bitcoin fundamentals...

I'd suggest that the OP read the following:

It should hopefully help clarify the way basic Bitcoins transactions work and how inputs and outputs are used/created.
16  Bitcoin / Bitcoin Technical Support / Re: Help locate? on: October 05, 2018, 04:27:48 AM
The transaction ID you have posted looks like a "Pay to many" transaction from an exchange (or similar).

Without knowing which address is yours, it's difficult to tell where your funds went.

Even knowing the address, it would still be very difficult to pinpoint an exact service based on the address itself.

Have you tried searching through your emails (or browser history) to find sign up confirmations etc from other crypto services? It might help narrow down which ones you have used...
17  Other / Beginners & Help / Re: Newbie start up in investing bitcoin. on: September 28, 2018, 10:03:52 PM
You haven't really contributed anything here other than: "I lost some money and then made some money" Undecided

With regards to your first few months where you lost, was that not also "learning by doing"? What exactly did you change between when you were losing and when you were profiting?

Knowing that is likely to be more useful to other newbies looking at getting into Cryptocurrency investing/trading.
18  Economy / Reputation / Re: this guy named suchmoon give me a negative trust for warning other about hyip on: September 28, 2018, 09:54:33 PM
lol enlightening people about scam hyip is worth for the red tag?

If that was all you're doing, then probably not... however as malboroza has highlighted, you're selling HYIP websites for $60. That IS definitely red tag worthy, IMHO.
19  Bitcoin / Electrum / Re: Electrum multisig 2of2 on separate machines and both offline(cold storage) on: September 28, 2018, 09:44:26 PM
I would have to concur with the others... as soon as I read that you created a transaction and signed it from only one of your 2of2 wallets and it was successfully broadcast and confirmed, my immediate reaction was "he has created the wallet using TWO xprv's instead of 1 xprv and 1 xpub".

In other words, your wallet has BOTH sets of private keys, so it is able to provide both signatures when signing a transaction.
20  Bitcoin / Electrum / Re: how electrum is updated on: September 28, 2018, 09:36:39 PM
I do not understand how to update, the only thing I see is download the latest version and install on top of the previous version
that is correct
the other is to uninstall the current version and then install the new version and the wallet will not touch
Correct... you simply run the installer for the new version and it will overwrite the old version. Also, uninstalling will NOT delete the wallet files, this is a safety measure by the devs so that you don't accidentally lose your wallet if you accidentally uninstall the app by mistake.

and on keeping a safe copy of the wallet is to copy and paste nothing else, that is what is referred to as a secure copy
thanks for answering
Not sure what you mean by "secure copy"? Huh

You can create copies of your wallet file and store them offline (on external drive or USB thumbdrive etc) if required. You can create the copy from within Electrum using "File -> Save Copy".

NOTE: If your wallet file is password protected then the sensitive data in the wallet file (ie. private keys/seed mnemonic etc) are encrypted which helps to protect your coins should the wallet file get leaked.

Arguably, the "best" way to "backup" the wallet, is to make sure you have an offline copy of your 12 word seed mnemonic, written down and stored safely and securely.
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