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881  Bitcoin / Mycelium / Re: Mycelium Bitcoin Wallet on: October 10, 2014, 09:10:02 AM
I don't know how you'd sign transactions on a phone by way of an external device that stores your private key (e.g. how Armory does it), but it would be awesome to see.
https://bitcointalk.org/index.php?topic=610453.0 "Sigsafe: A NFC key tag for signing bitcoin transactions"
I think Newar wasn't writing about external device, rather something like paper wallet and existing read-only addresses in Mycelium.

No, I was talking about two phones. One in the shop set up as watch-only. The cashier uses the "Receive" button, enters the amount in local currency and displays the QR code to the customer. The other phone (or "device") safe with me and with the full set of private keys. This was easily done pre-HD, looking forward to see it in HD too!



[...]
Synchronizing takes a bit longer the first time, because for HD some address discovery has to take place, but it should be fast for the next times.
[...]

Synchronising definitely takes noticeably longer "all the time" with the new release for me.
882  Bitcoin / Hardware / Re: The Habanero - 650GH/s - OOS on: October 10, 2014, 05:43:06 AM

MrTeal and xjack, also thanks for the input. I will try those suggestions.
883  Bitcoin / Hardware / Re: The Habanero - 650GH/s - OOS on: October 10, 2014, 05:41:54 AM
I know it will sounds odd but I've enjoyed a certain amount of success using bfgminer
[...]

Thank you for the input. Which version are you using?

On 4.9.0 I get a ton of:

Code:
[2014-10-10 07:32:08] hashfast fd=40: SEND (aa0b035203000050) => -1 errno=5(Input/output error)
 [2014-10-10 07:32:08] hashfast fd=40: SEND (aa0b035303000046) => -1 errno=5(Input/output error)
 [2014-10-10 07:32:08] hashfast fd=40: SEND (aa0b035403000024) => -1 errno=5(Input/output error)
 [2014-10-10 07:32:08] hashfast fd=40: SEND (aa0b035503000032) => -1 errno=5(Input/output error)

and others which go past too quick for a copy and paste.

After a few minutes it quits with:
Code:
Segmentation fault (core dumped)
884  Economy / Service Announcements / Re: [ANN] bitaddress.org Safe JavaScript Bitcoin address/private key on: October 09, 2014, 08:42:30 PM
In addition to the "Print" buttons, would it be possible to also add a "Save" button so that the wallet information could be saved on removable storage (for example, SD Card running Raspberry PI)?

Which OS are you using? You don't have the "Print as .pdf" option in your printer dialog?

Edit: Ok, RPi Wink  No option like that?
885  Bitcoin / Project Development / Re: crazy idea: use bitcoin to fund construction of a solar/wind/etc power plant on: October 09, 2014, 08:37:45 PM
[...]
    The thread indicates-" Between 158% and 183% of the original investment has been repaid." so i don't think it was a total failure of a project even with the big mistake of using solar.
[..]

Note that those are DiabloD3's (thread OP) comments. Diablo Mining Company has never built anything. Because of issues like "zero expertise in anything related to this and very little general managerial experience" for starters. Any "return" was thanks to the BTC rate rising from IPO time to close down time and measured in USD. People who just held the BTC instead of investing in DMC were a lot better off. Total failure is a good description of that venture.

But I agree, as an enthusiast's project with the land and hydro requirements (and some places you need the rights to use that water too) and not expecting any or very little return - sure why not.

I like this one: http://www.zotloeterer.com/welcome/ If I could, I would.
886  Bitcoin / Bitcoin Technical Support / Re: problems with bitcoin-qt on mac os x on: October 09, 2014, 07:59:19 PM
Hi,

you give me good tips. Thank you!
I will test it soon, but now I have another question:

Is it possible to start the sync with an another bitcoin program, like multibit, under windows 7?
I store before syncing my wallet from the mac os in the multibit file folder. And I store the bootstrap-file (23 GB) which I downloaded with torrent software.

Is this example possible?

thanks and

best regards

No, Multibit is not a full client and does not need the blockchain available locally.
887  Bitcoin / Project Development / Re: crazy idea: use bitcoin to fund construction of a solar/wind/etc power plant on: October 09, 2014, 07:39:40 PM

I'm usually not that blunt, but this has been tried before and it went to shit:
https://bitcointalk.org/index.php?topic=77469.msg861305#msg861305

Basically you are betting that you will be offsetting your initial cost of installing the plant against electricity cost of your mining competitors. Thing is, the major farms are getting such low electricity as they buy in bulk, they are way ahead of you.

Basic example:

You: 100'000 for a smallish plant, completed in x weeks, months.

Your competition: With 100'000 they can get electricity for 230kW for about a year at 5 cents.
Your competition is mining _now_ whilst you need to build that plant.

Please crunch your numbers before attempting this. Include network difficulty and exchange rate numbers too.

Also, internet speed is not that important for mining. The stratum protocol uses little bandwith. Depending on distance and topography you also could use a wifi antenna to reach several kilometers.
888  Bitcoin / Bitcoin Discussion / Re: Is old 3.5 floppy safer than USB drive for cold storage? on: October 09, 2014, 07:08:28 PM
Sounds good, but how would I get the QR codes off of the offline computer and onto the online computer. I can generate them on the offline computer and scan them into my phone, but how do I get them to the online computer without using a wand or some other USB interface I'm trying to avoid?

Built-in webcam on the online PC? Reads the QR code from the offline PC and you always can double check and compare the output the software provides (QtQR for Linux, for example). But depending on tx size you'll end up scanning several QR codes. (etotheipi's post)
889  Bitcoin / Bitcoin Discussion / Re: Is old 3.5 floppy safer than USB drive for cold storage? on: October 09, 2014, 07:04:05 PM
This is what I really don't *get* when Armory (in particular) talk about offline signing for "cold storage" - it always seems as though they are trying to solve problems for "idiots" (but they seem to forget that "idiots and ingenious" and are going to lose their BTC no matter which software they use - and yes I don't recommend CIYAM Safe for "idiots").

Why on earth would I have "40 donations" to a "cold storage address" that should never have never published. Huh

CIYAM Safe works perfectly on the assumption that you "know what you are doing" and you don't go "publishing your cold storage addresses publicly" (so there should only be 1 UTXO to deal with every time which works perfectly with just QR codes - one to receive the unsigned raw tx and one to send the signed raw tx).

Because like you said the other day, Armory is a wallet, that offers the possibility to keep the private keys cold. It's not a single key cold storage. Doesn't matter if it's 40 tx to one address or 40 different addresses. Say you have armoryd (watch-only) giving out addresses to customers. Later you want to spend from those, via the offline computer. There's the problem there.
890  Bitcoin / Mycelium / Re: Mycelium Bitcoin Wallet on: October 09, 2014, 06:55:42 PM
[...]
You can still have watch only addresses, tap the key plus button in accounts tab, select advanced, scan to import.
[...]

Yeah, but how about HD watch only? Sort of what Trezor does when you unplug the device. You still can request more receiving addresses as you please, but to spend you need to plug it back in.

891  Bitcoin / Mining support / Re: How do mining contracts (cloud mining) work? on: October 09, 2014, 06:44:57 PM
You really think OP's interest was purely academical?
892  Bitcoin / Project Development / Re: BitcoinAverage.com - bitcoin price index on: October 09, 2014, 06:15:26 PM
We wanted to ask the community if they have had any dealings with LakeBTC.com. They have extremely large volume for a new exchange and I don't know a single trader (and i know a few) that have used them.

https://www.lakebtc.com/api_v1/ticker

Just wanted to put the feelers out before integrating them into our system, it seems they paid Coindesk to integrate them into their index or have some other deal.

Note: Yes they do have fees for trades.

How come you are so cautious when you still have BTC China listed? How many traders do you know on that 0% fee exchange?
893  Local / Pilipinas / Re: Pilipinas (Philippines) on: October 09, 2014, 05:55:17 PM
Mark, thanks. I might have to buy on BTC-e. Do they have limits? [...]

No limits on btc-e. They are the shady BTC supermarket, woot wooot! Although you'll rip through the order book considerably with a market buy of that magnitude, offsetting the general lower price on that exchange.
894  Bitcoin / Project Development / Re: Bitcoins in space! on: October 09, 2014, 05:41:23 PM
New desktop wallpaper!
895  Bitcoin / Mining support / Re: How do mining contracts (cloud mining) work? on: October 09, 2014, 05:37:05 PM
[...] say $2000 for 12 months at 2TH/s. [...] 

Since the days of GLBSE, this is called a mining bond or turd. With ever rising difficulty you won't make profit. So, you have to bet on the BTC exchange rate. With this model and if you think BTC will rise, you'd be better off getting BTCs directly.


[...] In the second model, you purchase some amount of hashing power that mines for you (say 2TH/s at 0.001135BTC per GH/s), but you are charged daily/monthly maintenance fees. [...]

ckolivas' and my earlier post relate to that. Bottom line: If you can mine below the fees (and hidden fees) of the operators of those sites (and you have to trust them), mine yourself, you'll be better off.
896  Bitcoin / Project Development / Re: We've developed a bitcoin arbitrage platform on: October 09, 2014, 05:25:00 PM

Aye, risk, and markets not agreeing with a programmer's idea. As a former user of "auto-traded-forex" I can relate.
897  Bitcoin / Mycelium / Re: Mycelium Bitcoin Wallet on: October 09, 2014, 05:19:14 PM

Some thoughts from using the HD version on main-net for a bit:

Previously, as a merchant, I could have used Mycelium with a watch-only address at the shop without worrying employees would be able to get to the BTCs. I don't see that functionality now, unless I'm missing something. I think it is possible, as I have seen a "address generator thingie from a public master seed" website somewhere (probably the Trezor thread). Pardon the non-techie speak.


Synchronising the wallet seems to take a lot longer. Might be (hopefully!) because of the increased user base?


As HD basically means seeds, how can I enter my own dice-derived 24 (for example) word list to use it as an account? I have not yet backup-ed my account, if that makes a difference.
898  Economy / Computer hardware / Re: 2TH/s asic miner for sale on: October 09, 2014, 05:08:24 PM
 
3 BTC + shipping EU
899  Bitcoin / Bitcoin Technical Support / Re: Bitcoin QT wallet not showing bitcoins since transferring it to new computer!HLP on: October 09, 2014, 05:02:35 PM

Everything you put on the "cloud" consider it public information for other people to see.

Yesterday it was nudie shots from the beach, tomorrow it will be wallet.dats. Sure a password will put a timing fuse on it. Considering the majority of passwords in use that fuse won't be that long though. So, no, don't put your encrypted wallet.dat on the cloud. Put it on different types of storage media rather. CD, DVD, different HDDs, USB if you must. Things _you_ control.
900  Bitcoin / Bitcoin Technical Support / Re: Blockchain Erratic Sync Speed - Why? on: October 09, 2014, 04:50:35 PM
[...] You can "kick it" to get it going faster by shutting down Bitcoin-Qt and restarting it.  [...]

From my experience you also have to delete peers.dat for a successful "kick".
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