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1  Bitcoin / Bitcoin Discussion / Explain wallets to me on: June 16, 2016, 05:13:10 AM
Hi everyone,

I understand that the term "wallet" can be used to refer to the Bitcoin client software, such Armory, Electrum, or the official Bitcoin Core. What I'd like to ask about is the logical concept of a "wallet", that holds a collection of Bitcoins across these various products.

Is a wallet merely a collection of private/public key pairs that can be used to send/receive Bitcoins? How are these addresses generated? Is there a maximum number of addresses that can be generated per wallet? How does the client know if an address is in my wallet? How is a HD wallet (used in Mycelium) different from an ordinary wallet?

Also, I have a related question: according to the official Bitcoin website, an address should only be used to receive coins once. I want to put a donation link on my website. How can I generate a new address for each donation?

Many thanks
~LU

2  Economy / Service Discussion / Using gyft.com outside USA on: June 05, 2016, 05:52:14 AM
Hi everyone,

Amazon.com does not accept Bitcoin, but gyft.com sells Amazon gift cards for Bitcoin, so there is a workaround.

However, when I went to sign up for gyft.com today, it told me it is only available for residents of USA.

I have access to a VPN provider that has servers in America. Has anyone been able to access gyft.com from places outside USA using this technique?

Many thanks
3  Bitcoin / Wallet software / Recovering coins from Hive on Android on: April 16, 2016, 08:23:10 AM
Hi everyone,

I went to use my Hive wallet on Android today, and it would not open. According to https://hivewallet.com/ the project has been ended.

I only had 0.1 BTC in that wallet, but I would appreciate any help in recovering it. I still have my passphrase.

Thanks.
4  Economy / Goods / Easiest way to sell paper wallets on: April 03, 2016, 11:13:01 AM
Hi everyone,

I have three paper wallets with 1 BTC on each. I would like to sell them for AUD$500 each.

What's the best/safest way to do this?
5  Bitcoin / Electrum / Easiest way to sweep into Electrum on: November 27, 2015, 09:19:54 AM
Hello,

I have some bitcoins stored on a paper wallet, that I want to sweep into Electrum. What's the easiest way to do this? I have a webcam that can read QR codes.

Many thanks
6  Economy / Services / [0.1 BTC] Attention: Photoshoppers! on: January 21, 2015, 06:48:03 AM
Hi all,

I'm urgently looking for someone who can scale and retouch a very simple black & white logo for me. Final product needs to be 6 inch x 6 inch at minimum 300dpi in jpeg format.

I can make a negotiable offer of 100 mBTC.

The logo itself is a surprise, so contact me ASAP in you are interested.

7  Bitcoin / Bitcoin Technical Support / Trouble with Blockchain on 0.9.3.0 on: October 30, 2014, 12:03:47 AM
Hi everyone,

I'm experiencing issues with Bitcoin-Core 64-bit on Windows 7. I have used the command line argument -datadir=H:\AppData\Bitcoin to download the blockchain to my external HDD. This has been working fine. All of a sudden, the software says "Synchronising with network. . ." and is working veeeeeery slooooooowly. Overnight, it's gone from approximately 1 year 25 weeks behind to 1 year 10 weeks behind. Any idea what I should do?
8  Bitcoin / Armory / Alternate Storage for Blockchain & Databases on: September 09, 2014, 11:47:15 AM
Hi all,

I've been using Armory for a while, and I'm very happy with in. However, the blockchain is now approximately 25GB, and the Armory databases are approximately the same again. My poor old 256GB SSD is filling right up.

Is there a way to migrate the Bitcoin blockchain and Armory databases to an external drive? Any help here is appreciated.

Thanks,
~LU
9  Bitcoin / Electrum / Master Public Key and Addresses on: July 19, 2014, 01:30:17 AM
Hi all, I'm trying to educate myself about some of the technical details of wallets. My current understanding is that a wallet contains a series of addresses, each of which consists of a public and private key. (Correct me if this is wrong)

I use Electrum, which allows me to view and export a "Master Public Key". This enables me to view all the transactions of that wallet ie use all the public addresses.

How is the Master Public Key related to the public addresses of a wallet?
10  Bitcoin / Electrum / QR Scans plugin on Windows 7 on: July 12, 2014, 04:24:37 AM
Hi all, I've just started using paper wallets to give BTC to family & friends. I'd really like a Bitcoin client that supports QR code scans. I was delighted to see that Electrum supports this as a plugin, but I haven't been able to get it working under Windows 7. I went to http://zbar.sourceforge.net/download.html and grabbed the 0.10 windows installer. It installs and works, but the Electrum plugin option remains grey and unavailable.

Does the QR scans plugin work under Windows 7, and if so, how do I make it available?

Thanks,
~LU
11  Economy / Computer hardware / [WTS] Blu-Ray Disc Writer BNIB $20 on: June 17, 2014, 02:23:13 AM
http://www.gumtree.com.au/s-ad/deakin/components/liteon-ihbs212-blu-ray-disc-writer/1049099334

Brand new in box with SATA interface, Lightscribe and PowerDVD.
12  Economy / Computer hardware / [WTS] Corsair HX620W PSU $30 on: June 13, 2014, 12:39:52 AM
http://www.gumtree.com.au/s-ad/deakin/other-electronics-computers/corsair-hx620w-modular-power-supply/1049062632

Great for powering an Antminer S1.
13  Economy / Computer hardware / [WTS] BitFury USB ASICs on: April 17, 2014, 10:18:05 AM


I have for sale 3x Blue Fury and 5x Red Fury USB ASIC. Each unit mines at 2.0 to 2.4 GH/s.

Make me an offer.

Selling from Australia.

For a compatible hub, please look at https://bitcointalk.org/index.php?topic=562848.0
14  Economy / Computer hardware / [WTS] D-Link DUB-H7 powered USB 2.0 hub $10 on: April 09, 2014, 07:39:16 AM


For sale: 2x D-Link DUB-H7 7-port powered USB 2.0 hub.

Ideal for USB ASICs including Block Erupters; Antminer U1 and U2; Blue and Red Fury devices.

The power supplies operate on universal voltage: 100-240V

One power supply is Australian; the other is European -- but I'll throw in a free adapter for Australian buyers.

Fully compatible with MinePeon/Raspberry Pi.

USB cable included.

Full Disclosure: the power supplies provide up to 3A which is enough to power six USB devices. However, if the devices have BIG heatsinks, you'll only be able to fit four. In other words, you won't be able to use all seven ports for miners. The two "fast charge" ports don't have any effect on miners.
15  Economy / Computer hardware / [WTB] Antminer S1 on: April 07, 2014, 05:30:08 AM
Looking for a seller who can ship to Australia. New or used. I need the version with 6-pin PCIe power connectors. Price negotiable. Will pay extra for tracked shipping.

Also interested in purchasing a compatible power supply unit.
16  Bitcoin / Hardware / Antminer U2 dimensions on: April 07, 2014, 04:04:09 AM
Can anyone tell me if Antminer U2 ASICs can fit next to each other in a USB hub, or if they need to leave an extra port as room for the heatsink?
17  Economy / Computer hardware / [WTB] Red/Blue Fury ASICs on: February 02, 2014, 12:25:34 AM
Hi all,

I'm trying to find a supplier/seller who can provide me with Blue Fury ASICs. I'd like to buy at least five. I would take new or second hand. I can do BTC or PayPal. Price negotiable.

Thanks
~LU
18  Bitcoin / Mining / p2pool not paying out? on: January 28, 2014, 09:16:55 AM
Hello,

I've been mining on p2pool @ 6.5GH/s for a couple of weeks, and I haven't seen any payouts yet. Is this normal? Is there a better pool I can use (one resistent to ddos attacks)?
19  Bitcoin / Armory / Maximum/Spendable BTC not reporting correctly on: November 02, 2013, 12:33:12 AM
I think I just discovered a little bug where the total amount of Spendable and Maximum funds is not correct. It's only taking the total of one of my wallets and not the sum of all of them. Is this a known issue? If not, I can post a screenshot.

I'm using 0.89.99.5-beta
20  Alternate cryptocurrencies / Altcoin Discussion / Block Erupters with Alternative Cryptocurrencies on: October 28, 2013, 12:35:50 AM
I have 10 USB Block Erupters on a MinePeon setup that earn me a few cents a day. I'd like to switch to an alternative cryptocurrency. According to wikipedia Namecoin and PPcoin are both based on SHA256.

How can I get my setup mining either of these two?
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