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2901  Bitcoin / Electrum / Re: Question about Electrumx Server on: May 29, 2019, 08:50:44 AM
If you are referring to the configuration when setting it up, yes. The name of the 'COIN' variable should be "BitcoinSegwit".
2902  Bitcoin / Armory / Re: did not show on: May 29, 2019, 08:46:12 AM
More information please.

Do you have core installed and fully synced ?
Is armory connected to core ?
Is the address correct (did you double-check it) ?
Does your address contain balance (check on blockchain explorer) ?

If you can answer each question with yes, upload the armory logs using https://pastebin.com (or any similar site) and provide us the URL.
2903  Bitcoin / Bitcoin Discussion / Re: SSD vs HDD: what it means for Bitcoin scaling? on: May 29, 2019, 08:43:36 AM
Storage ? No. Not a problem at all.

There are a lot reasons why increasing the blocksize will harm the state of decentralization of BTC. But storage is not one of them.

You can buy a 1 TB SSD for ~150$ currently. That's enough storage for the next 15 years at least.
Even with a blocksize increase, do you think 1TB SSD's are the maximum for an average buyer ? That the technology will not improve in the next 10-20 years ?

Or one could simply buy a 4TB HDD for ~120$. You don't need the blockchain to be stored on a SSD. A HDD is fast enough for the blocks itself.
What you should store on a SDD is the chainstate folder, which has quite a lot read/write operations happening.
2904  Economy / Services / Re: Looking for Blockchain (Crypto) Messenger developer on: May 29, 2019, 08:32:39 AM
What exactly are you looking for ?

Are you looking for a whole project (including full nodes, etc..) or are you just looking for a desktop application.

If you are only looking for a desktop application, how is it related to blockchains at all ?
If you are looking for a whole project, do you mean something like Bitmessage ?
2905  Local / Deutsch (German) / Re: BestMixer has been seized (BestMixer wurde beschlagnahmt) on: May 29, 2019, 08:12:15 AM
Letztendlich ist die Frage, ob Bitcoin wirklich als Zahlungsmittel die Zukunft gehört,
oder doch eher im Peer2Peer Bereich Privacycoins a la Monero oder Zcash?

Es gibt diverse Verbesserungen für das base layer von BTC um die Privatsphäre um ein vielfaches zu erhöhen.

Aktuell wäre das wohl coinjoin, was an sich in Ordnung ist, aber noch lange nicht genug Privatsphäre bietet um sich neugierigen (und technisch affinen + mächtigen) Augen zu entziehen.
Aber trotzdem, Coinjoin in Verbindung mit Schnorr Signaturen wären schon ein erheblicher Gewinn was Privatsphäre angeht.

Wenn dann statt Coinjoin, Payjoin und Payswap verwendet werden (siehe: https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-April/016888.html), werden keine privacy coins mehr benötigt.
Dann hätte BTC weit aus mehr genug Privatsphäre als nötig um regelmäßige Tageseinkäufe damit zu erledigen ohne von Google getrackt werden zu können.
2906  Other / Beginners & Help / Re: Anybody explain to me difference between confirmation & block time? on: May 29, 2019, 07:46:54 AM
What is it mean for "Two block" mined?

This means it is the average time it needs for a new block to be mined.
For example: If a block has been mined right now, you can expect the next block to be mined in 10 minutes (on average) -> Time between 2 blocks being mined.



Let's say bitcoin has a block time of 10minute, so what is the confirmation?

The transaction gets the first confirmation when it will be included into the block.
This could be the next, the after next, or the 40th block from now on.

Once it is included into a block. Each block which builds upon, adds 1 confirmation to the transaction.


For example:
Currently are 80 blocks mined. You broadcast the transaction. It takes roughly 3 hours for it to confirm. Your transaction is being included into block #101.
It now has 1 confirmation.
Then, 60 minutes later, 6 new blocks have been generated -> we are at block #107 now. -> Your transaction has 6 more confirmations -> 7 confirmations in total.


On average(!) you get a new confirmation each 10 minutes (after the first one) because the average block time is 10 minutes.

2907  Bitcoin / Hardware wallets / Re: Ledger Nano S usability questions on: May 29, 2019, 07:35:44 AM
Alright just to confirm linux virtual machine or windows 7 wont run smoothly with the ledger live app and you get problems such as usb connection issues etc.?

Windows 7 definitely doesn't, because it is not supported.

A linux virtual machine seems (at least in your case) to not work properly with the nano s.
You can't generally say that you WILL get usb connection issues with with your virtual machine. But since the OS on your VM is supported and your nano s is not broken, it seems like the VM is the point of failure.



To get it work in linux I have to do a proper boot of linux not in virtual? I thought virtualbox linux virtual machine is like a proper linux with no difference between a proper bootable linux?

Your linux in the VM is a proper linux.
But the host OS (your win7, but doesn't matter which OS) handles the 'forwarding' of the USB connection to the VM.

It is an encapsulated machine with interfaces being managed by your host OS.


A regularly installed linux would have direct access to the USB ports and therefore no 'middleman' which can mess up something.



Is there anyway or tips or tricks I can do to get the linux virtual machine working like a proper linux?

As mentioned, it is working like a real linux itself. The problem are the interfaces. Or more precisely: the management of the USB interfaces by your VM software / windows.

However, i believe it should work in a virtual machine.

Just to confirm, did you update the udev rules on your virtual machine ?
Check https://support.ledger.com/hc/en-us/articles/115005165269 under "Linux" on how to do this.
2908  Bitcoin / Development & Technical Discussion / Re: How to prove to someone that an Bitcoin address (or UTXO) belongs to you? on: May 29, 2019, 07:27:57 AM
There is only one way certain way to prove ownership, and that is by giving your PRIVATE KEY to that someone.

If we're strictly talking about certain way to prove ownership,  then even giving private key isn't enough. There are many cases where user tricked into download fake/malicious wallet where the theft could use it to prove ownership.


If we are strictly talking about ownership (in terms of: i created the private key, it belongs to me), there is not a single method to absolutely be sure (in a bulletproof way).

A private key is not something one has, but something one knows. That's a big difference.

Proving ownership of a hardware token (i.e. a hardware token for pgp signing for example) can be done by signing messages easily.
But simply proving ownership of something you know is itself not possible (very strictly talking).

Information (something you know) can be duplicated. Hardware tokens (something you have) can not. Or.. at least they should not be able to be duplicated.


However, i think this is going way too far.
As per OP's title the question is how to prove that an address belongs to you. And regarding this, anything is fine. A signed messages (containing a random token + user not blatantly stupid to get phished) is the best way.
The question was not how to prove that one is the ONLY one who knows this private key. That's simply not possible.
2909  Bitcoin / Wallet software / Re: How do I manage my Bitcoins locally without downloading the entire blockchain? on: May 28, 2019, 12:30:51 PM
Define random.
Define trustworthy.

Random like could also be any other wallet. 
Not more trustworthy or better than any other random wallet.

In fact, even less trustworthy because of all their scamming.



TBF, that's the case with any other GitHub repo. You can actually upload whatever you want to your GitHub repo binaries (even if it's different than the source code on the repo). How are they uploaded and who has access to it?

Sure, thats's right.

Check the commits -> build from source. Danger circumvented.

Just because the majority of people don't do it, it still CAN be done. And that's the big difference to a closed source wallet.



I don't think they are a scam and that's it.

And you are wrong with this.

Changelly has scammed a lot of people. This is a fact.

Whether their wallet has bad intentions or not is anyone's guess.

But the fact that they operate illegally from russia.. doesn't make them really trustworthy, does it ?


I'd rather choose exodus.. hell or even jaxx (yes, no-security-jaxx) than touching anything from changelly.


I really don't care what wallet you are using, but saying that this wallet 'has a name behind it' - in a positive way - is misleading for newer people here.
2910  Bitcoin / Hardware wallets / Re: Ledger Nano S usability questions on: May 28, 2019, 11:38:31 AM
Ok when you say passphrase do you mean the 24 word seed?

No. I always try to be as precisely as possible.

In my words:
Passphrase = A passphrase you can set (a password)
Mnemonic code = A seed encoded into 12/24 words
Seed = very long random number (rarely(!) also means the mnemonic code for easier understanding)



Which tool apps you recommend to download for a average user like me? Im kinda worried on how much storage does the device have to install all these apps.

This depends on what you are using.
If you want to install multiple non-wallet apps, you probably won't be able to have all installed at the same time.

But you can always just uninstall, install a different application, uninstall it and reinstall the first one.
The data will NOT get lost. It is always derived from your seed.



Yeah its linux virtual machine and yeah i added the usb empty filter. What could the problem be?

I currently don't have a clue, sorry.
The virtual machine itself might be a problem, i don't know.

I would also suggest to simply update to windows 10.
Windows 7 is outdated, way less secure and you should have stopped using it like 3 years ago.

If you don't want to upgrade to win10 - for whatever reason - your fallback option would be a bootable linux distro (or even a dualboot beside windows).
This definitely works, since it is like a standard linux install.
But it is way less convenient.. you'd have to reboot your machine each time and boot into your live distro.
2911  Bitcoin / Wallet software / Re: How do I manage my Bitcoins locally without downloading the entire blockchain? on: May 28, 2019, 11:31:38 AM
While I agree that closed souce wallets are bad and not fully trustworthy, this isn't just a random wallet.

They aren't trustworthy at all.
Currently, it is just a random wallet.

How can you be sure that they actually know how to code software properly ?
You can't check what the wallet is doing. You have to blindly trust the developer.

How are the binaries uploaded ? Who has access to the github ?
You can't even be sure that a new version is truly being uploaded by the original developer instead of someone who gained access to their github.



It is owned by Changelly (so they have a name behind it).

A name which already scammed dozens of people.
Rather have no name behind it, than THIS one.



And while I also don't particularly really trust Changelly, I don't think they made this wallet to scam people. It's like Exodus (IMO).

Their main purpose might not be to scam people, but as mentioned.. Access to github, intentions turning into bad ones, code quality.. all factors which you can't control.

With open source, you'd be able to check what the software does. Find backdoors in new updates, etc..
Closed source? No chance.
2912  Other / Beginners & Help / Re: What is Bitcoin Mixer? on: May 28, 2019, 11:25:43 AM
I guess the list should be updated, the number 1 in the list just made an announcement

Bitcoin Blender is shutting down. Please withdraw.


Good that its just number 1 mentioned in this list, and not number 1 of all mixers  Wink



Not sure of what will happen on the currently actively mixers.

I don't hear news about bitblender having the same problem with bestmixer, but they just shut down their business.

They probably are scared now.
Happens if you can't properly organize the infrastructure.

For anonymous, professional and reliable mixing, ChipMixer is the only option right now.
2913  Bitcoin / Electrum / Re: Is pressing the button 'Select Server Automatically' is safe? on: May 28, 2019, 09:03:08 AM
It is safe.
If the server doesn't work properly, choose a different one (note that you have to untick the 'select server automatically' option for it to work).

Also, no server was 'hacked'.

Old versions of electrum had a 'vulnerability' which allowed server to show a message.
This was exploited by quite a lot malicious server to show a faked 'update message'.

Your coins never were at risk. Never download electrum from anywhere else than https://electrum.org/.
And preferably always verify the signature before installing it.
2914  Bitcoin / Bitcoin Technical Support / Re: About lost bitcoins on: May 28, 2019, 08:13:22 AM
Hi please give me your email so we can talk alright?


Wow, only 4 people (with 2 DT of them) claiming this newbie is a scammer.

Guys, better trust him everything you have.
2915  Bitcoin / Electrum / Re: Completely new to Bitcoin just downloaded Electrum, help set it up properly plz. on: May 28, 2019, 08:06:43 AM

  I want to make it clear I never ever needed an Electrum Desktop Bitcoin Wallet which I am using Windows 7 and I am told that it's the worse O.S. to use and Mac second safest and Linux being safest.

I have a Oracle VirtualBox VM [...]

Regarding safety overall, yes. That's correct.

But as bones261 already pointed out, in a targeted attack it doesn't matter which OS you are using.

Since 98%+ of all malware is written for windows, using MAC / linux is definitely a safer option. Especially when storing BTC on your computer.


Note, that running linux in a virtual machine won't protect you at all.
If you host (your win7) is compromised, your guest (VM) will be too. Just not vice versa .



 Is the difference between using a Nano Ledger S U.S.B. Wallet Vs. just my regular WD Passport Portable 2TB U.S.B. Hard-Drive which has a Password for Encryption and that's it is the Encryption Capability of those U.S.B. devices and the Trezor Bitcoin U.S.B. Wallet etc.

Hardware wallets do not only store your private keys encrypted.
They have a secure element built in, which does not leak the private keys under any circumstances.

The secure element itself is responsible for signing transactions upon approving them on their built-in screen.
The private keys are basically always cut off from the internet or from an internet-connected device, which is not the case with your computer.

Encryption is only one (small) aspect which makes a hardware wallet secure.



 Now regardless of the answer to the question above is Downloading Electrum on my Password Protected WD Passport U.S.B. Hard-Drive more secure than just leaving Bitcoin on my Desktop Electrum Wallet which will be Online 24/7 as I leave my Computer Online to Upload Torrents for my Tracker to give back to the Downloading Community Tracker I am part of.

Where electrum is installed doesn't matter.
It matters where your wallet file is stored.

You can easily install electrum directly on your main drive, but store the wallet file on your encrypted hard drive.


But generally, yes if your wallet file is stored on a drive which is connected to your computer all the time, it is less secure than a non-mounted and/or encrypted hard drive.

However, once your computer is compromised (e.g. with a malware which waits for you to open electrum), it doesn't matter where your file is stored if you open it anyway at some time.



 If I Send Bitcoins to my Wallet it does not exactly seem as Easy to use as Advertised as I got my Bitcoin Address I can find it for the Bitcoin to be Sent to my specific Wallet now I am wondering if I simply use Add And Remove Programs to uninstall Electrum and Re-Install on my WD Passport U.S.B. Password Protected Hard-Drive which I won't loose and unlike the Hard Drive for my Computer it is less likely to stop working as it is not constantly being used 24/7 which is another reason why I am not asking whether I can even Download and USE ELECTRUM ON THIS Portable 2TB U.S.B. Hard-Drive or if I can only use it on my Desktop Windows 7 Computer which is constantly online.

You CAN use it wherever you want.
Make sure to have a backup of your 12 word mnemonic code, and you are fine.



I got more questions but I thought I'd start with these.

Feel free to ask as many questions as you want. A lot of us will be happy to help you out where we can.

Quote from: Malcom Forbes
One who never asks either knows everything or nothing.
2916  Bitcoin / Mycelium / Re: I dont know where is cold storage creation in Mycelium.. pls help? on: May 28, 2019, 07:48:21 AM
To import a watch-only wallet, you can simply add a new 'account' and then enter either an address or the master public key (xpub).

But AFAIK, you can not create unsigned transaction with mycelium.

The 'offline wallet tool' from the drop down menu is for importing private keys / xpriv / seeds from a printed version (e.g. from a paper wallet).
This is not for creating unsigned transaction on an offline mobile.
2917  Bitcoin / Hardware wallets / Re: Ledger Nano S usability questions on: May 28, 2019, 07:33:45 AM
Congratulations on successfully updating and repairing! Smiley


Ok I remember when I bought the ledger nano s device couple of years ago it came with a pre-installed app called fido u2f. What is this app and shall I download it?

This is an application for 2FA.

This basically is a hardware token (comparable to RSA secureID tokens).
This is way more secure than using a 2FA application on your mobile.

Whether or not you want to use it, depends on you.



What other apps from ledger manager store that are not coin specific wallet apps? Like for example recovery check app is a tool not a wallet coin app.

You can check this site for all available apps.
Scroll down to the bottom to see non-wallet applications.

One example would be OpenPGP (useful if you are using PGP).



Under device settings>security>passphrase> what are these 2 settings: set temporary and attach to a pin?

Attach to pin:
Will create a second 'ledger account'.
You then will be able to login either with your first or your second pin, each of those two generating a different set of private keys / addresses.

Temporary:
Creates a second 'ledger account' for just one session.
This is basically the same as above, just that the information are not stored on the nano s.
You will have to enter your passphrase each time you want to access this 'temporary account'.



Ok... Im experiencing a new problem now and that is adding accounts in the ledger live app. I can add ethereum account but i'm not worried about ethereum account as I had 0 balance in that anyway however I worried about bitcoin as I can't seem to add btc account, the problem with the btc account is showing on my monitor it says connect and unlock your ledger device in which I do and get a tick then when it says navigate to the bitcoin app on your device in which i follow and do it goes back to the connect and unlock your ledger thing again which keeps spinning forever and nothing happens and cant access my bitcoins! I tried disconnecting usb and connect usb again but still same problem.

I have the latest versions of the apps.

Is there known bugs in the latest ledger live 1.9.1 in regards to btc app?

In which OS ?
Your linux VM ?

Did you add the USB-filter "empty" to catch all USB devices ?
2918  Bitcoin / Bitcoin Technical Support / Re: About lost bitcoins on: May 27, 2019, 02:04:28 PM
Hi teknonix I had a situation similar as I lost about 2 to 5,000 btc but I still have my wallet file. Is there anyway you can help me get my bitcoin back. I can give you tip . Please say.

To you and any other newcomer reading this:

Do not share your wallet file with strangers. That's how you get your coins stolen.


Another tip for newcomer:

Do not accept wallet files from stranger which claim to have 'lost bitcoin' in there.
There might be some vulnerability for code execution etc. in core, which would lose to your system getting compromised.

Or.. it simply is malware.
2919  Bitcoin / Hardware wallets / Re: Ledger Nano S usability questions on: May 27, 2019, 02:01:10 PM
Now the main $64,000 question is which option do I select under repair your ledger device in ledger live app:

- Bootloader?
- MCU not genuine?
- Follow device repair instructions?

I fear if I select the wrong option I may really brick my device.

Do you have a problem with the Bootloader? Yes.
Is your MCU non-genuine? No.
Repair device? Maybe.

Choose yourself. You can not brick your nano s with the built-in functions from ledger live.



So far my experience with ledger hardware and software is not so good and this will not go down well with new crypto beginners coming into the crypto world and if there is truly to be world wide adoption of crypto where hardware wallets are like personal secure banks then this complex troubling experience has to go from hardware wallets 1st.

Well.. you are using an outdated OS which is not supported by ledger live.

The majority of people do not have a single problem with their nano s.

Do you finally have access to a windows 10 machine or linux or mac (something which is supported) ?
Or are you still trying to fix it using windows 7 ?
2920  Bitcoin / Electrum / Re: Questions about address derivation (old versions) – potentially lost a few BTC on: May 27, 2019, 01:57:37 PM
WTF man! You're not using the "Electrum seed system"! You came up with your own custom scheme and now are blaming electrum for it.


To be fair.. he didn't blame anyone.
He politely explained what the did and asked for ideas on what could have happened and how to recover his coins.

I don't see a single statement from him blaming electrum.
Whether there was a change in the 'seed system' (aka derivation) is a normal question. No blaming there.
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