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October 19, 2018, 05:03:23 PM *
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 / Bitcoin Discussion / Re: Wallet safety? on: Today at 04:48:29 PM
I think that the safest system for our precious coins to save them in exchange. Because you can use google autenticator when you login to exchange and it is in your hand in your smart phone. When i use my exchanges first i use google autenticator then i use text messages code. So if you use them together no one can steal your money. It is safer than MEW i believe.

I disagree..

What if the exchange locks your account?
What if the exchange gets hacked?
What if the exchange turns scam?
What about a mitm attack?
What if you fall for a phising link?
What if your pc gets infected with a password stealing virus?

If you are not the only one in controll of your private keys, you are not in controll of your funds.

Do not store your funds on an exchange longer than you need to complete a trade... 2fa authentication or unique passords will not save you from these attack vectors (except the last one)

The best wallet in the market is the AML BitCoin wallet. This coin cant and will never be hacked.
I had never heared about this one, did some research... It turns out aml bitcoin is just some altcoin. This has nothing to do with the discussion about bitcoin wallets
2  Bitcoin / Bitcoin Discussion / Re: Wallet safety? on: Today at 12:34:25 PM
Yes,it's safe as long as you use strong passwords and keep your private keys.
You can change your current OS to Linux and download the Sandboxie software or a decent malware scanner program,like Malwarebytes.

This subject is important. The Linux operating system has no virus definition. In other words, it is safer than other OSs because the computer does not run viruses.

That's an urban legend:
Linux is not immune to virusses, however it's security model is built in a different way than window's security model, next to this the amount of desktops running linux is smaller than the amount of desktops running windows (so a virus writer will be tempted to write a windows virus instead of a linux one because a windows virus can do more damage due to the amount of potential victims)

Also, AFAIK, both sandboxie and malwarebytes only have windows binaries available, it's no use to tell somebody to switch to linux AND use sandboxie or malwarebytes
3  Bitcoin / Bitcoin Discussion / Re: Wallet safety? on: Today at 11:27:06 AM
I'm a longtime member, and even i have 3 or 4 electrum wallets on my PC (i seldomly use them tough, i've switched to hardware wallets a long time ago)... I guess it all depends on you:
  • Do you run a recent version of your OS
  • Do you download unknown programs from unknown sources
  • Do you open email attachments
  • Do you have a recent firewall installed
  • Do you have an up-to-data virusscanner
  • Do you install OS updates/patches on a regular basis
  • Do you tell other people you hold BTC?

In general, if you keep a small amount of BTC on a pc with an up-to-date OS, virusscanner and well configured firewall, and you don't install unknown programs or open unkown emails, you should be relatively* fine... Even if you have multiple wallets on your pc.
There is a bit of a discussion about which OS is the safest. Personally, i think that *nix OS's are safer out-of-the box AND are safer if they're hardened by a seasoned user. But in case you don't know anything about *nix and you do have some experience managing windoze boxes, you might be better off sticking to microsoft products instead of trying to configure an OS you're unfamiliar with...

If you hold a bigger value in crypto currencies and/or you don't think you have the experience/will to run a tight system, you might be better off with one of the following methods:

  • A hardware wallet
  • A properly generated (bip38 encrypted) paper wallet
  • An (encrypted) offline/cold wallet on an airgapped PC

*relatively fine: in the past, security flaws have been found in popular, opensource wallets... So as long as you run your wallet on a pc that is connected to the internet, you're never 99.9% safe.
4  Economy / Service Discussion / Re: We need BTC payment gateway for tor on: Today at 10:12:10 AM
Can somebody recommend a bitcoin payment gateway that supports the tor network.

We are working on developing a marketplace and we need to implement btc payment system. We searched online and most of them do not support tor.


If I was setting up a hidden service i wouldn't touch a thirth party payment provider with a ten foot pole (or a 3 meter pole if you're from a country that uses the metric system like me Wink ).
It isn't hard to run bitcoind or a monero daemon on tor and use the json rpc interface to generate new addresses, monitor incoming funds, create new transactions, sign messages,...

If you want to use a thirth party payment provider, you'll probably need to find one that also runs a hidden service, otherwise your customers will be shown an invoice on the clearnet... I doubt they'll be happy about this. I actually doubt your customers will feel safe and secure if you'd use any kind of thirth party payment provider at all... Why involve more people than you strictly have to involve?

This being said: i personally don't like darknet marketplaces... But it's up to you to make sure you follow all laws and rules that apply in your country...
5  Bitcoin / Bitcoin Discussion / Re: Help on a transaction on: Today at 06:06:25 AM
I am admittedly a Bitcoin novice.  I recently requested some funds be sent via Bitcoin from one of my online accounts to my wallet at Electrum.  The sender has given me a transfer confirmation that the transaction was carried out thru to the wallet address that I had requested.  However, the funds are not showing up in my wallet.  What do I do now?

1) verify on an independant blockchain explorer (like enter the deposit address you generated using electrum in their search field, and see if there is a CONFIRMED transaction funding this address

IF this is the case, the problem is on your end... If it's not the case, it's on the sender's end

IF the problem is on your end:
1) check if the button on the right hand side of the electrum screen is green
2) check if the electrum version you have is the latest version
3) try to restart your electrum wallet
4) double-check if the address you gave to the sender was indeed generated by your wallet... (since electrum doesn't see an incoming transaction, the address should still be the address that's being shown in the receive-tab of electrum).
5) by clicking on the green (or red/brown) dot on the bottom right corner, you can manually switch electrum servers... You can try a couple and see if it changes anything (not likely if the button is green tough... A lagging electrum server is indicated by a brown button, a red button means no connection.. IIRC)
6) if everything else fails, you can always try to re-install a fresh copy of the latest version of electrum on a clean pc that is defenately able to connect to the internet, restore your wallet using the seedphrase you initially got and see if it is able to detect an incoming transaction

One other potential thing i can think of: are you 100% positive the person paying you sent BTC, not BCH or some other altcoin?
6  Bitcoin / Bitcoin Discussion / Re: how many transactions to include in a block? on: October 17, 2018, 08:07:51 AM
Block is a number of transactions that have been confirmed and shared in the Bitcoin public ledger. Initially able to accommodate up to 36MB. But to reduce ddos attacks on the network, then it is limited to 1MB.

With this limitation, miners can mine Bitcoin up to 1MB. Blocks larger than 1MB means invalid. So why is this maximum limit needed?

- To maintain consensus
- Avoid Centralization of Pool
- Make Full Nodes More Worthy

Technically, since segwit, a block can theoretically be 4Mb (on disk), however 3Mb is reserved for the witness data in order to keep backwards compatibility for the "old" nodes that still have the 1Mb limit. Offcourse, in reality, a block will almost never reach the 4Mb limit, but will probably be very close to the 1Mb limit after you disregard the witness data.

The average transaction is at least 250 bytes and the average block contains more than 500 transactions. Source: Mastering Bitcoin Chapter 7, page 164.

I haven't done the math, but my gut feeling tells me that if you'd only take the average amount of transactions per block for the last year, you'll get a lot more than 500 tx/block on average... Offcourse, if you take the all-time average, it'll probably be a lot lower (possibly around the ~500tx/block range... idk)
7  Other / Meta / Re: mass ban on: October 15, 2018, 01:02:07 PM
OP is an alt account of the banned polyballz. His case was discussed a week ago:

My post is fine, nothing is empty, this account is made zero, does not buy other people.

You're breaking the rules right now by making multiple posts in a row.

You've been banned likely for this:

I don't know exactly, but as bitcoin decentralized online digital currency, bitcoin makes transactions anonymously, then there has no chance to add bitcoin under regulation. This is just my observation. We will see in future

Until now, I have never heard of any country that regulates Bitcoin or even the central bank. because bitcoin is decentralized online digital currency, bitcoin makes transactions anonymously, so there's no chance to add bitcoin under the rules. This is only my observation. We will see in the future.
I already know and correct this, but I ask about the mass ban

Sorry for the fact that i quoted so many posts, but i felt it was necessary to make the following observation:
1) you were banned
2) you opened a thread in meta to discuss your ban
3) you were told that you were banned for copy/pasting
4) you acknowledge this fact, but still keep on posting

Did you read the rules after you were banned? If you continue posting in more than 1 thread or outside meta while being banned, this is  called ban evasion. This is a bannable offence...
8  Other / Meta / Re: My Account Hacked @theymos @sathosi please help on: October 15, 2018, 08:31:49 AM
It might be a good idear if you start by reading this sticky post:

btw: it seems like theymos and cyrus are waaaaay behind on account recovery... You might have to wait weeks/months/years before your account gets recovered, so don't get your hopes up.

However, if you post the signed message (as explained in the post i mentioned) in this thread, one of the mods can probably lock your account, so the hacker can't abuse it and get it banned/tagged...

Last note, a bit offtopic but still: satoshi dissapeared a long, long, long time ago... So don't ask him to help you...
9  Other / Meta / Re: Why was my account banned and how to aviod it ? on: October 15, 2018, 05:31:27 AM
I just joined the bounty. Why do they ban me ? I am so confuse .

I'm going to talk about how i personally see things... This might not be the same reasoning the moderators followed when they banned your account.

I've been here for a long while, and it seems a lot of "bounty hunters" don't see this forum for what it really is: a BITCOIN TALK forum. This forum was created to discuss and promote bitcoin. If it's primary purpose was to spam ico bounties it would have been called instead of

Now, you say things like: "i only joined an ico bounty and it forced me to post 10 times a week", and you think it's unfair you got banned because of it, but in reality, the ico bounty doesn't really belong on this forum. You've joined a thirth party service that is a big nuicance to this forum... For most longtime members, those bounty thingies are a grey area, they're frowned upon to say the least... So if you join such an ico bounty, and then produce crap posts just to meet your 10 posts/week criterium, you're going to get banned sooner or later.

Last (fair) heads up: IIRC, you only get 2 or 3 temp bans before a permaban... So since you were banned 2 times before, you're heading for a permaban right now... Once you're permabanned, it's you (as a person) and not your account that is banned... If you continue down this path, you'll soon be no longer permitted to use this forum alltogether...
10  Local / Nederlands (Dutch) / Re: Faktuur in mijn bitcoinwallet. HOE? on: October 12, 2018, 11:59:11 AM
Normaal gezien gebruiken ze de bitcoin: URI

Hier is een voorbeeldje (heb m'n eigen adres ingevuld, dus niet op klikken Smiley ):

meer info:

Als je electrum niet als portable of standalone draait, zal de bitcoin: uri normaal gezien door de installer gekoppeld zijn aan electrum, dus als je op de bovenstaande link zou klikken, zou normaal gezien electrum automatisch moeten opengaan, zou het label "Mocacinno" aan de betaling moeten hangen, zou m'n address automatisch moeten ingevuld zijn, zou de value 0.001 automatisch moeten ingevuld zijn, en zou de message "Fooi voor mocacinno" automatisch ingevuld moeten zijn... Moet je enkel nog op "send" klikken, en alle metadata word netjes in je wallet opgeslagen Wink
11  Bitcoin / Electrum / Re: Electrum lost seed (laptop crash) on: October 12, 2018, 11:26:55 AM
I am using tails and when i start electrum om it tjey say they delete everything after a restart of the laptop and bcz it just shut down, all the electrum files --》 deleted

So i guess with this what i write im fiucked up wright?

most probably, yes...
Unless you used the persistence feature, or saved the wallet on a different medium, the wallet is gone. In other words: if you didn't take explicit action in order to save the wallet file persistently, it is gone... This feature is clearly documented in tail's documentation.

leave no trace on the computer you are using unless you ask it explicitly;

It has nothing to do with the hardware, you just chose to use a live OS that is configured not to leave a single trace.
You never explicitly said you didn't write down the seed, but i'm pretty sure that not answering this question is an answer on itself...

I hope you didn't fund the address generated by your wallet with to much... If it's just a couple bucks, you should probably consider it a tuition fee... Next time, make sure you understand the technology you're using, and read the messages that are printed on your screen... When you were generating a wallet, the seed must have been clearly shown to you, and in the next step of the wallet generation, you must have been asked to repeat the seed phrase that was shown to you... IIRC, the messages shown in this step clearly tell you you HAVE to save the seed on a piece of paper.
Electrum even goes as far as clearing the clipboard between the two steps, so you can't just copy the seed in the first step and paste it in the second step... There's a reason for this.

Sorry for your loss...
12  Bitcoin / Project Development / Re: WIN 0.5 ETH BY FILLING OUT THIS 1 MINUTE SURVEY on: October 12, 2018, 10:01:34 AM
Put the prize money in escrow, otherwise I just don't believe that you'll actually send the money.
Even then, you could just pick yourself as the winner, but there's at least actual proof of the prize money that way.

How do you put coins in an escrow for a survey? I think the survey site has to enable that kind of things. Like deepwebmarkets that have escrows.
Is there a platform for putting money in escrow?

Anyway I bite, filling the survey.

Pretty simple, he can even combine escrow with provably fairness:
1) he simply has to pick a reputable escrow from this forum. Here's a list:
2) he has to contact the reputable escrow he picked, make a deal with this person, send him 0.5 ETH + escrow fees and make sure the escrow posts a SIGNED message on this thread, saying that he (the escrow) holds 0.5 ETH and will pay the winner of this contest directly
3) the OP has to build some sort of provably fair mechanism. The easyest would be to let everybody pick, for example, 10 random characters and enter them during the last step of the survey together with their ETH address
4) the OP has to set a deadline when the survey will be closed and as soon as the deadline is over, post everybody's ETH address and 10 randomly chosen characters in his OP, AND pick a future blockheight at the same time (for example, current blockchain height of the BTC network + 20). It would be best to archive this post to avoid future discussion.
5) When the block at blockchain height picked in point 4 is reached, the participant whose 10 random characters have the least distance to the last 10 characters of the sha256d hash of the blockheader at this height wins the 0.5 ETH which is payed out by the escrow.

This way, the OP can't cheat anybody out of their time...
Everybody participating in the survey should take screenshots to prove they entered the survey. If the OP doesn't list them as participants, or changed their ETH address, the user should contact the escrow with the proof, so the escrow can take action and make sure the ETH doesn't end up in the hands of an alt of the OP.
13  Bitcoin / Alternative clients / Re: Is Ledger Nano S REALLY SAFE ?? Best Hardware Wallet ? on: October 11, 2018, 11:19:48 AM

have a doubt about the ledger nano s and the 24 word recovery phrase. if the 24 words are already decided beforehand and already assigned to each wallet isn't this is a breach of security? infact if there was an employee or somebody (or a system) detecting what each wallet 24 phrase is , can't it be restored on another wallet and the private keys stolen (and the money)?

or is the recovery phrase chosen by us at the moment , after we open the package?

The recovery phrase should be generated by you... This is usually done when you initialse the hardware wallet. If you receive a hardware wallet that was already initialised, you shouldn't use it (IMHO). Hardware wallets are cheap, you shouldn't buy a used one, but instead buy a new one directly from the company itself, so in case it's initialised you can consider it to be compromised, and you have no idear if the person comprommising the hardware wallet messed with the hardware itself to.

If you don't trust the company itself, you can always use different (offline) tools to generate a seed phrase, and enter this independant seed phrase in your hardware wallet.

BTW: answering to a thread that has been inactive for 6 months is frowned upon. You did the right thing by using the search function and not creating a new thread, but in this case it might have been better if you found a more recent thread or created a new one anyways Wink
14  Bitcoin / Electrum / Re: Electrum lost seed (laptop crash) on: October 11, 2018, 11:10:36 AM
I agree with the previous posters, but i did want to give a "formal" answer to your question:

No, if you only have the funded address and a password used to encrypt your wallet, there is no way to recover your wallet.

You need one of these:
  • The seed phrase that was shown to you when you created the wallet (it should have been indicated quite clearly that you really NEEDED to save the seedphrase... IIRC, you even have to prove you wrote down the seed before you can continue the wallet creation wizard)
  • The wallet file AND the encryption password (if you don't remember the password, but you chose a weak one, or you have a decent idear what the password might have looked like, there are ways to brute-force it IF you have the wallet file)
  • A list of all the private keys whose public key hashes (addresses) were funded (but i guess it's a longshot, since you didn't seem to have saved your seed phrase, i doubt you have used the function to export private keys.... BTW: it's not a good idear to export private keys to begin with, just save the seed phrase next time)

Like LoyceV already said: stop using the disk, unplug it, put it in a different machine as secondary disk (don't boot from it), then use a tool like dd to clone the disk containing your wallet file... Then copy the disk image, and only after you have 2 copies of the image from the disk that was in the "crashed" pc, you can proceed with tools like recuva and try to restore the wallet file.
15  Economy / Reputation / Re: Merit begging on: October 11, 2018, 09:35:24 AM
@LoyceV: great to see you take action against such a character Smiley... Slightly offtopic, but still relevant: i can still read this guy's email address, even after you tried to blur it... If you were serious protecting his email, you might want to swith to a different blurring tool Wink
I personally use greenshot on my work pc (windows), it's image editor has tools to completely remove any part of a screencap and/or securely blur any part of the text...
16  Bitcoin / Bitcoin Discussion / Re: Blockchain API alternatives on: October 09, 2018, 11:16:14 AM
Instead of re-hashing the same things the first 2 posters already said, i'll offer an alternative:

Why don't you run your own wallet on your server and use it to create new deposit addresses and manage payments?

There are 2 good alternatives:
1) Run bitcoind, lock your wallet, use json-rpc queries to make new addresses, use the callback function (walletnotify=path_to_script %s) to detect incoming transactions

2) OR, run electrum as a daemon

Personally, i'd prefer the first option (bitcoind), but electrum gives you the possibility to create a watch-only wallet by importing an xpub instead of generating a "real" wallet with an xprv. Since the online machine never touched the seed or the xprv, the worst a hacker can do is steal your xpub and find out which deposit addresses were generated by your store.

17  Other / Meta / Re: I need a reason on: October 09, 2018, 10:04:04 AM
Hello! I do not understand what's going on with a friend's account.;u=1983411
He recently gave up some money to buy copper. and now you lock him
This morning he came in and received a message like this: " Sorry duythan1988, you are banned from posting or sending personal messages on this forum.
You have been banned by a forum moderator. You may appeal here: "
I know he's just a hunter, but that does not mean he's banned. he needs a reason. please !


Firstly, from experience, most longtime members don't believe you if you say you're appealing a ban in the name of a thirth party (your friend). In most (if not all) of these cases, it's the person who writes the appeal that is perma-banned, but this person doesn't want to admit he/she is the one that is banned because he/she wants to play the sympathy card, or he/she wants to continue posting without risking a ban for ban evasion.

As for the reason you're banned: i'm not a mod, i'm not an admin, i'm not the person that reported you, but from experience, i can say that in most of the cases, it's because you (or your friend) copy/pasted content. In some parts of the world, plagiarism isn't taken seriously... However, in the US (where the admin is located), plagiarism is a serious offence (you can actually go to jail for plagiarism).

Here is a full list of the rules:
Read the post and see if any of these infractions apply to you...

I don't know if there is a premade list of perma-bannable offences, but i guess it would contain following infractions:
- copy/pasting content
- ban evasion
- spamming (i think a spammer gets 3 temp-bans before he/she receives a perma-ban)
- doxxing the admin
18  Bitcoin / Bitcoin Technical Support / Re: adjust block chain memory usage on: October 09, 2018, 07:51:27 AM
I don't really get your question either, like others have asked before:
  • Are you worried about running out of diskspace
  • Are you worried about the amount of data that is being transferred (does your ISP have a data limit?)
  • Are you worried about the amount of memory that's being used while running bitcoin core?

Anyways, i'd say that pointing you towards an SPV wallet would be the best course of action...

I'd like to recommand either a hardware wallet (in case you have a lot of funds invested in crypto) or electrum (

An SPV wallet only downloads the block headers, the wallet only keeps the xprv and the metadata you added... I haven't run electrum in a while, but i guess the total diskpace used by the binary, the wallet and the headers is <100Mb (confirmation needed).

Also, the amount of data transfered is small, and the memory footprint is a lot smaller than bitcoin core.

The downside is that you won't be verifying the blocks yourself, and you need to be connected to a thirth party electrum server...
19  Bitcoin / Development & Technical Discussion / Re: Why hardware personal wallets are almost impossible to hack unlike exchanges? on: October 09, 2018, 07:05:40 AM
FYI, Bitcoin Gold also use 10 minutes block interval and previous attack reverse 21 blocks which is far above common minimum required confirmation (which is between 1-6 blocks). In this case, almost all user/services would be affect and the only solutions are another rollback or/and ridiculous minimum confirmation amount are the only solution.

Thanks for the info  Grin
The only remark i have is that bitcoin gold isn't equal to bitcoin. It's not because bitcoin transactions only require 1-6 confirmations to be considered irreversible that this amount is transferable to bitcoin gold just because it's codebase is allmost equal to bitcoin (i know it has a different POW). So, the exchange should have done it's homework and asked for more confirms because of the low difficulty (but it's all hindsight, it's easy to give comments on an event that already happened).

However, 21 blocks re-mined is a huge attack, i don't think i'd ever require 21 confirmations if i was selling something (nor do i think an exchange should require 20+ confirmations with an average time between blocks of ~10 min), so in the case of the bitcoin gold attack, i would have been scammed aswell (even with my hardware wallet).
20  Bitcoin / Development & Technical Discussion / Re: Why hardware personal wallets are almost impossible to hack unlike exchanges? on: October 08, 2018, 09:56:33 AM

As bob123 already explained, it depends on the coin. If the coin is weak, the underlying weakness of the coin's blockchain (in this case not enough hash power) can become a liability for the exchange because a hacker can intervene and double-spend some coins. For example the scenario may go like this: first they send some coins to the exchange and immediately spend them (say, buy BTC with them); then they use their 51% power to fork the blockchain at some earlier time and regain their already spent coins. I might be wrong, but I believe that's what happened with Bitrex and "Bitcoin Gold". The only thing the exchange can do in such a case is to delist the altcoin in question.

But in this specific case, i don't see it as a exchange-related problem. Sure, an exchange was used to monetize a 51% attack, but a hardware wallet wouldn't have protected you either.

For example:
  • you were selling irreversible digital goods and accepted "Bitcoin Gold" as a payment method
  • you generated a "Bitcoin Gold" address using your hardware wallet
  • the "bad guy" funded your address
  • You transfered the digital goods without waiting for sufficient confirmations
  • the "bad guy" executed the 51% attack, excluding the tx funding your address and including a tx that spends the unspent output used to fund your address

In this case, you would have been robbed, even when you were using a HW wallet...

It's not smart to use an exchange as a wallet, but in case of a 51% attack, a hardware wallet isn't 100% protection either... The only difference is that an exchange *might* require to few confirmations for a low diff coin, whilst a private person using a hardware wallet can chose the amount of confirmations arbitrarily
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