I have a watching wallet on Windows 10 on electrum 2.7.11. I have saved a transaction and saved it to my USB key and transferred it to my offline PC which is never connected to the internet. Ever.

I load electrum 2.7.9 on there and load the transaction from USB key. All good so far. When I click Sign, I get a message saying please wait, signing transaction... and then Error. Server did not answer.

Well, obviously because it's offline. How do I sign a saved transaction?

I love bitcoin and have a loaded wallet on my smartphone ready to spend, but it doesn't make any economic sense to spend it.

For example

I bought a new headset today in UK and was quoted £55.97 for it. The bitcoin price at the checkout was 0.2539 BTC. If I spent the BTC and replenished I would have been charged 58.91 for it (+5%), and localbitcoins best offer was £59.40 (+6%)

I paid by debit card, despite me loving the tech, I'm not going to pay a 5-6% tax on every purchase using bitcoin.

I want to set the units to µBTC but can't find it in Electrum 1.9.8 GUI on Windows 7. I changed the config file so that

Code:

'decimal_point': 8

but that didn't change it. Any way to do it?

[Must have]

I've been using Mycelium on Android for a while, and am happy with it except it reuses addresses. I really don't like that so have been looking to move to Greenaddress.it. I installed it on my Nexus 5 and it is really, really slow. Is it just me, or do other people find that? I don't think it's production ready yet so might have to stay with Mycelium for now, unless there are other suggestions for good Android wallets that don't reuse addresses?

My requirements:

Must have

• No address reuse
• Fast
• Easy to use

Desirable

• Deterministic wallet, with watching only function on other devices

Needs to work exceptionally well on iOS (iPhone, iPad), Android (phones and tablets) and Windows Mobile. Perhaps even think about integrating it into the Tapatalk app.

I think we're in for a quiet week or two and then some big moves.


Obviously because I've said that we will get some big moves in the next week or two, and then it will go quiet... 

I really didn't expect it to be this exciting but it was. Maybe that says a lot about me.

I just bought a motherboard from scan.co.uk and paid with bitcoin. When I clicked "pay with bitcoin" I got this screen:



I opened mycelium on my Nexus 5 and bam, paid. Eight minutes later, I got transaction confirmed. I feel like I've made history in my home, which is true or I'm totally deluded. I replenished the bitcoin from bittylicious and that is already in my wallet. Can't wait for the day when I don't need to do that anymore... 

I am a receiver in a transaction which has a 0.2mBTC fee about 40 minutes ago and have not had a single confirmation. On blockchain.info it says this:

Estimated Confirmation Time    Very Soon (High Priority)

Why is that?

Black, unlocked. In south east England, PM me for more details. In great condition boxed with everything, earphones never used. Some tiny scuffs and marks but you have to look really closely to notice. Will accept bitcoin.

Mainly on principle on Apple's hostility to bitcoin. I've got Mycelium installed and it works great. Now, I've got an iPhone 4S 16GB I don't want and need to sell it. However, I just checked eBay's fees. 10%! WTF?! When did that happen? Can you suggest somewhere else to list it in the UK for sale without the exhorbitant fees? Would love to sell the iPhone for bitcoin...

[significant BTC missing from my wallet]

I've got my bitcoin in cool storage - basically in an encrypted virtual machine on a separate computer (bare metal hypervisor) from my main machine. I've done a video on this in the Electrum forum if you're interested in the details. Anyway, I think it's pretty secure. I have a watching only electrum wallet on my main PC which I look at from time to time, and I also have my addresses including the next five deterministic addresses in my blockchain.info wallet.

I sent a donation to Andreas's Dorian fund from cool storage using my USB stick to get to my private keys and all was well, everything went through as expected. I logged in to my blockchain.info wallet last night and noticed that there were some significant BTC missing from my wallet.  

I started to panic thinking that my cool storage had been compromised, but I couldn't understand how because the cool storage VM is always powered off unless I want to spend. Also, only one address had been drained, all my other addresses were fine.

Can you guess what the problem was? The BTC were not stolen.

Come on, what was it? Guess before continuing...

















I had forgotten about how change addresses work. Sure enough my wallet was complete when I expanded the change addresses section in electrum. I have now added my change addresses as watching addresses in blockchain.info and my balance is exactly how I expected, nothing missing.

Just thought I'd tell my story, because my heart was really racing last night! Anyone had a similar experience?

I feel like such an idiot. Anyway, the above program has been promoted in bitcoin chat rooms/channels and some websites. If you downloaded it assume you have a remote backdoor and keylogger on your system. Remove it with Anti-Malware program.

On windows 7 it creates many msdcsc.exe processes and is difficult to remove. They don't appear for a few days to stop arousing suspicion, and only appear after you have done a reboot.

A full virus scan, anti-malware scan is recommended. I haven't lost any bitcoin because my private keys are on an offline linux machine, but I'm going to change all my bitcoin related passwords and reinstall my system. PITA.

Did I mention I feel like an idiot? I'm usually very careful with these kinds of things.

I have electrum and Multibit wallets. If I want to send bitcoin to a QR code in an image, what's the best way? I don't want to do it on a smartphone because I don't have a smartphone wallet.

For example how do I send to this address from Multibit?

[Cool Storage.]

I made a 3 part video series on how to set up Electrum for Cool Storage.

Thanks to @Lavender and @Abdussamad for helping me set it up. I didn't find it that easy, so I thought I'd do a few videos to help others set theirs up.

I am calling it Cool Storage because it is not on a physical separate machine, so I felt it wasn't right to call it cold storage, but I think it gives adequate security if you don't have a spare machine dedicated to offline storage, and is certainly more secure than using a bitcoin client on your main online Windows PC.

If you find it useful there's a Tipping address: 14o6RP2dnyehLCtz6Cdc2vsg2iL6tZ2zNd

I don't have a YouTube account so have uploaded to media fire, where the videos can be downloaded for offline viewing if you want, can also be streamed I believe.

Part 1 How to set up a VirtualBox machine with Lubuntu Linux inside to host the wallet
http://www.mediafire.com/watch/ny38wj7u7iqbx3u/Bitcoin%20Cool%20Storage%20How%20To%20-%20Part%201.mp4

Part 2 How to install and configure the offline wallet and the online "watching" wallet. How to send bitcoin to cool storage
http://www.mediafire.com/watch/8hw3dd4p8x8f9yw/BitCoin%20Cool%20Storage%20How%20To%20-%20Part%202.mp4

Part 3 How to spend money from cool storage
http://www.mediafire.com/watch/nzo3j0ibs3yb737/BitCoin%20Cool%20Storage%20How%20To%20-%20Part%203.mp4

Single link to all three files
https://www.mediafire.com/folder/tjycvj1q73cfz/BitcoinCoolStorage

Hope it helps someone.

I want to receive payments and want a different address for each payment in an offline Electrum wallet. How do I tell it to create a new address to receive payments without it having to go online? I never want the machine with the seeded wallet to ever go online.

I'm testing my cold storage solution, here's what I've done.

Booted into Ubuntu 13.10 Live CD. Went to bitaddress.org and loaded the page. Pulled out my network cable. Created three wallets BIP38 encrypted with a 30 char passphrase which was generated from LastPass. The paper wallets were printed to pdf and stored in a truecrypt volume.

I've sent 0.01 BTC to one of the addresses as a test, and it seemed to work OK. I now want to test that I can spend that by sending it back. How can I spend a bitaddress.org address securely?

Thanks for any tips.

I don't have cold storage for my coins yet but I want to address that and get my coins off my PC and into something more hack-proof. However I don't want to use the same address for my drip-feed to cold storage. What are the options here? Every transaction I have done has been with a different address so far, can I do the same with cold storage? How is that done?

Thanks

I did it on my laptop with my trackpad, but how to do it on a desktop PC? (And don't tell me to use CTRL--).

[In the last month alone]

I'm putting a plan together to ask UK High St. retailers what their plans are (if any) to accept bitcoin as payment. My aim is to find out for myself how serious the High St. is about bitcoin, and to test the level of knowledge/interest from major retailers in bitcoin.

My email to them will be:

Hello,

As you are probably aware a new payment network is rapidly gaining adoption across the world. The payment network already exceeds the transaction value of PayPal, and is on track to exceed in terms of number of transactions too. This payment network is called bitcoin. Advantages to you as a retailer are:

Lower transaction costs - you do not need to pay/charge for credit card fees, banking fees.
Promotional value - if you declare you are accepting bitcoin it shows that you are a forward-looking innovative company and you will certainly get a lot of media attention from this declaration
Competitive advantage - you will take a lead over your competitors by investing in the network early

In the last month alone, the number of merchants accepting bitcoin worldwide has grown 173%. Investment in the bitcoin infrastructure has grown 17%. The number of consumer wallets has grown by 63%. Sources: www.bitcoinpulse.com

As you can see, the bitcoin payment network is here to stay, that much is certain, and I would like to know when you plan to investigate it, and ultimately offer it to your customers as a payment option.

Regards,
yenom


My current target list is:
John Lewis
Tesco
Sainsbury
Asda
Morrison
Co-operative
M&S
Boots
Amazon
Argos
Next
B&Q
Debenhams
ASOS
New Look
River Island
Thomas Cook
Currys
Cineworld
IKEA

I would appreciate any modifications to my communication that you think I should adopt and any retailers you think I should add. I will post all responses from the retailers to this thread along with some metrics such as response time, number of requests to get an answer, etc.

Thanks

I am currently using bitcoinwisdom for charts, but really like the look of trading view and have a free account. However on my PC it looks like the charts are delayed in a weird way for BTC/USD. Do they just remove the previous day? All the other symbols work OK EUR/USD is accurate enough for example.

Do I need a pro account to see all bitcoin data? As far as I know Mt Gox don't charge for their data at the moment.

BitcoinWisdom


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