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1781  Bitcoin / Development & Technical Discussion / Re: Payment Address Validation on: February 25, 2017, 08:10:49 AM
  • Replace the web page file on the webserver with one that has the attacker's master public key

Why not just replace the web page?

Payment requests work because we rely on commercial CAs to validate identities. How is the server's public key going to be checked in this scenario?

1782  Bitcoin / Electrum / Re: HELP ME - Problem transaction (rejected by network rules) 258 on: February 25, 2017, 07:54:32 AM
what version of electrum are you using?
1783  Bitcoin / Electrum / Re: HELP PLEASE !!!!!! What does Electrum wallet use ????? on: February 25, 2017, 07:47:29 AM
if both multibit and electrum have difficulty connecting to the net then it's likely you have a firewall or antivirus software of some sort blocking connections.

also calm down and stop with the exclamation marks.
1784  Bitcoin / Electrum / Re: Transaction Unconfirmed for 48+hrs on: February 23, 2017, 12:53:57 AM
You should make sure you have dynamic fee set under tools > preferences. As for why this tx is not confirming:

https://tradeblock.com/bitcoin/

There's a backlog of 100k transactions! It's getting worse!
1785  Bitcoin / Electrum / Re: how to get real-time bitcoin price in electrum? on: February 22, 2017, 09:54:24 AM
change to a different source for the rates under tools > preferences  > fiat

but i want only source: blockchain.info

well it may be that bc.i is having problems. maybe they blocked your ip or something.

right now i'm seeing lower prices there than on stamp:

https://blockchain.info/ticker

https://bitcoinwisdom.com/markets/bitstamp/btcusd

i wonder where bc.i gets its data from?
1786  Bitcoin / Electrum / Re: how to get real-time bitcoin price in electrum? on: February 22, 2017, 09:46:11 AM
change to a different source for the rates under tools > preferences  > fiat
1787  Bitcoin / Electrum / Re: how to get real-time bitcoin price in electrum? on: February 22, 2017, 09:38:15 AM
the btc price is fixed in my client for a long time already , still dont know how to do

you could try restarting the client.
1788  Bitcoin / Electrum / Re: how to get real-time bitcoin price in electrum? on: February 22, 2017, 09:37:23 AM
don't install add ons from arbitrary sites. it is very dangerous.

iName please open source your add on so that people can review it. put it up on github.
1789  Bitcoin / Development & Technical Discussion / Re: Payment Address Validation on: February 22, 2017, 09:34:53 AM
addresses are not private. the private portion is called the private key. in  order to generate addresses without exposing the private key you simply install the wallet's extended public key aka xpub and master public key on the server. then you can safely generate all the addresses you like without risking theft of bitcoins sent to said addresses because it isn't possible to generate the private keys from the xpub.

opensource code to do the above is available for a variety of languages. if you tell me which language your app is coded in maybe i can point you in the right direction. for example for php there is bitwasp's libraries:

https://github.com/Bit-Wasp/bitcoin-php

and smaller set of libraries in the bitcoin way plugin:

https://wordpress.org/plugins/bitcoin-payments-for-woocommerce/

note that you need a bip32 deterministic wallet for this. you shouldn't be using any other type of wallet anyway. software that creates deterministic wallets includes electrum, mycelium, bitcoin core and bitpay wallet.

Ofcourse addresses are not private.

I don't want the servers do any address generation, deterministic or not. They just fetch an address when someone wants to send money.

But I do insist upon the web server having a way to validate the address it fetched belongs to me, not to a hacker who injected it into the database (which is likely a different server than the web app front-end) and that's why I create a signature for each address signed by the private ECDSA key I use as a seed on my machine that generates addresses. The signature in hex is only 128 characters long, and the public (not private) ECDSA key from the seed can then be used to validate the signature was generated by someone with the private key.

There are many problems with this. First of all you are supposed to trust your own servers. You can't design an app where you think some of the servers might be compromised while the others aren't. That's just crazy.

Second if you are going to store the public ecdsa key then you might as well use that to generate addresses independently on the webserver. This is deterministic address generation. Why bother with the whole signature generation and validation?

Quote
It would defend against MITM attacks (which can happen even with TLS) changing the payment address, and it would defend against malicious attackers injecting their own payment addresses into the web application.

bitcoin payments can't be reversed, so we have to defend against that kind of fraud before it happens. Validating the payment address really belongs to the website using cryprography is the only sure way to know it does.

Payment requests are similar to what you are talking about here. That uses TLS which for some reason you don't like. I don't know what to say.
1790  Bitcoin / Development & Technical Discussion / Re: Payment Address Validation on: February 22, 2017, 06:58:54 AM
addresses are not private. the private portion is called the private key. in  order to generate addresses without exposing the private key you simply install the wallet's extended public key aka xpub and master public key on the server. then you can safely generate all the addresses you like without risking theft of bitcoins sent to said addresses because it isn't possible to generate the private keys from the xpub.

opensource code to do the above is available for a variety of languages. if you tell me which language your app is coded in maybe i can point you in the right direction. for example for php there is bitwasp's libraries:

https://github.com/Bit-Wasp/bitcoin-php

and smaller set of libraries in the bitcoin way plugin:

https://wordpress.org/plugins/bitcoin-payments-for-woocommerce/

note that you need a bip32 deterministic wallet for this. you shouldn't be using any other type of wallet anyway. software that creates deterministic wallets includes electrum, mycelium, bitcoin core and bitpay wallet.
1791  Bitcoin / Electrum / Re: Backup of a wallet on: February 22, 2017, 05:22:54 AM
I have encrypted my wallet file with 7zip and uploaded to my cloud; and i will use the same wallet for next transactions. If my computer lost, would i able to use my coins?

yep. btw just setting a password on the wallet encrypts the seed in the wallet file so there is no need to encrypt it again with 7zip.
1792  Bitcoin / Electrum / Re: [2.7.18] can read default_wallet history, can't send money on: February 22, 2017, 05:21:46 AM
when I tried to create a new one, I only crated a new wallet.

What happens when you restore your wallet? To restore your wallet from seed go to file menu > new/restore. Then enter a name for the restored wallet. The wallet creation wizard will start. Select "standard wallet" and then click next. Now select "I already have a seed" and click next. After that you will be asked to enter your seed and then set a password if you like. Follow the on-screen instructions until your wallet is created. You can then send the money to coinbase.
1793  Bitcoin / Electrum / Re: [ArchLinux] Who is "Timothy Redaelli" and why is he signing electrum on: February 12, 2017, 09:30:25 AM
executable is never signed by anyone. it's always the compressed download file that is signed.

Redaelli is probably the package maintainer. That's how it is with linux distros.
1794  Bitcoin / Electrum / Re: Electrum 2.7.9 on Tails can't sign offline, I get "Server did not answer" on: February 12, 2017, 09:22:22 AM
it shouldn't. but hey that's an older version. so upgrade if you can.
1795  Bitcoin / Electrum / Re: unconfirmed on: February 04, 2017, 09:27:08 AM
Hi,
I am new with BTC and I've read now a lot of threads about the topic "unconfirmed" or "stuck" transactions. Problem is: I sent the BTC six hours ago. I used the normal, standard fee. Now I read I should have used more, with dynamic what I will do the next time. First Question: Can I "cancell" the transaction and give more fee? Than it will probably faster?

Unless you are in a hurry in most cases it is easier just to wait it out.

Quote
Seconds: when I update linux/electrum is there a possability that I "loose" btc?

Make sure you write down the seed and store it somewhere safe. As long as you have your wallet seed you can't lose your bitcoins.

Quote
Also: when I change the server, could I loose it?

The worst thing that can happen is that the server feeds your wallet incorrect transaction data and then you act on that and lose money/property because of it. But electrum takes steps to make that hard to do so it highly unlikely.

Quote
After some hours a new problem is coming up now: in the lower left is always staning: "Synchronizing ..." nothing changes. Should I maybe get a other version?
I can be patient, if it will be sent in some hours, than its no problem. I just want to know, if a made a mistake Sad

You should upgrade to the latest version because it has support for dynamic fees which make transaction confirmation delays much less likely.

The servers we all rely on are run by volunteers so they do sometimes go down. You can try switching to another server via tools > network. Also may be donate to the server operators  Smiley. You can see their address on the console tab.
1796  Bitcoin / Electrum / Re: Electrum STUCKED on: February 04, 2017, 03:29:40 AM
watching only wallets are exactly what the name implies. you can't spend the money there because the wallet doesn't have the seed with which to generate private keys for your addresses. so unless you noted down the seed or have a seeded wallet file (not watching-only) you can't spend those coins and they are lost forever.
1797  Bitcoin / Electrum / Re: Electrum ( watching only wallet ) with balance. Can i move the coins out on: February 03, 2017, 11:38:16 AM
I recommend updating electrum first. Download the newest version from electrum.org and install it.

You don't have to delete any files at all. Use file menu > new/restore to begin the process of creating a new wallet. To restore from seed first select "standard wallet type", click next and then on the next window "i already have a seed". After that you enter a seed and a password if you like.

Use file > open to open that wallet in future.
1798  Bitcoin / Electrum / Re: Bitcoin update problem ( € 150,- for the solution) on: January 30, 2017, 09:23:46 PM
Stop messing about with private keys and don't use other software. You should be able to restore from seed using electrum itself. Download and install the latest version of electrum. The versions you are using are all old. Then do a wallet restore using your seed. Give it time to sync. Does it work now?

If it doesn't then run electrum to create a new wallet file. This is so that you can get to the window with the menus. Switch to a different electrum server via tools menu > network. Now try a restore from seed again (file > new/restore).
1799  Bitcoin / Electrum / Re: Can't find my BTC after restoring from seed on: January 30, 2017, 08:44:37 PM
Don't give up just yet. Could you please PM me the master public key of your wallet? The master public key (MPK) will allow me to enumerate all the addresses in the wallet. I won't be able to spend your bitcoins but I will see all the addresses and transactions. You can find the master public key under wallet > master public keys.

Alternatively create an issue on github to catch the developer's attention because it looks like you've hit upon a bug.
1800  Bitcoin / Electrum / Re: Can't find my BTC after restoring from seed on: January 29, 2017, 09:56:50 PM
UPDATE: I've tried the Mnemonic Code Converter, unfortunately I was not able to find any of my address from that wallet. Definitely I will try other settings for that tool tomorrow. Thank you all who involved. 

Don't do that. You shouldn't be entering your seed on any sites! Your seed should always be kept secret.

Please open your restored wallet in electrum, press ctrl+A to bring the addresses tab into view and then  tell me whether there are any familiar address listed there.

Also what version of electrum did you use to originally create this wallet? 2.7.18?

Did you increase the gap limit of your wallet?

The wallet was created with electrum 2.6.4, The gap, indeed was increased, after restoring the wallet I've increased it again with 1000 as I did it before. No luck again. I really want to understand what happened with my coins and how to avoid this particular situation in the future.

Are you sure that 1HtDHigRkCPs1Ux6MPhXZ3N85i6ASnm1uA was previously in your wallet and that Electrum was showing your coins?

If so, it sounds like you restored the wrong seeds as the wallet.is_mine command should have returned true if you owned that address. Is it possible that you have multiple seeds and restored the wrong ones?

I am 100% sure I restored the correct seed. Before I've started the transaction, my balance was 5.45887085. Next I made only transaction and it was 4.368099. So "1HtDHigRkCPs1Ux6MPhXZ3N85i6ASnm1uA " would be a change address if I understand it correctly.

After restoring my wallet from seed I've noticed that my last transaction was -5.45887085 and my balance is 0. Before hardware fail the last transaction displayed was -4.368099 and my balance 1.09077

Try the ismine command again now that you've increased the gap limit.
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