Bitcoin Forum
July 01, 2016, 03:23:32 PM *
News: Latest stable version of Bitcoin Core: 0.12.1 [Torrent]
  Home Help Search Donate Login Register  
  Show Posts
Pages: « 1 2 3 4 5 6 7 [8] 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 ... 457 »
141  Bitcoin / Bitcoin Discussion / Re: re-use of addresses on: May 07, 2014, 01:22:59 PM
But this view is not universal, apparently:

Reusing addresses is therefore the preferred method of maintaining the privacy of your sources.

I still don't get how a dozen people sending to a single address of mine is protecting their privacy better than if I provide one address per transaction.  And I'm more interested in MY privacy than theirs, anyway.  If they want privacy, that's their job to mix or obfuscate -- not mine.

And then further that post reads ...

And perhaps the ultimate best practise tip, a heuristic for the intelligent use of Bitcoin:

Take whatever the Core Devs say and do the exact opposite.

I don't even.
142  Economy / Service Announcements / Re: [ANN] - a location-based bitcoin to cash marketplace on: May 05, 2014, 12:39:06 PM
Looks like they re-opened prematurely .... seeing sluggish performance, getting HTTP 500 errors, etc.

We are having some performance issues right now. ETA for getting basic functions working is 2-3 hours.

After logging in now I see:

We are working on the issues
We are experiencing heavy load right now. The site might respond slowly and you might run into issues. However please still feel free to try to access some of the site functionality. Our team is working on this and we should be back in business in a few hours.

But none of the trading functionality (e.g., Dashboard) is available.
143  Economy / Currency exchange / Re: Buying Btc via Bank-Western union-Skrill-amazon-neteller or Paypal on: May 05, 2014, 12:10:42 PM
Buying  Cheesy

Sent a PM.
144  Alternate cryptocurrencies / Marketplace (Altcoins) / WTS 0.2 XBT payment made via Moneybookers/Skrill service on: May 05, 2014, 12:08:20 PM
This is for a trade using Skrill's service that pays to an M-PESA number.

The countries that Skrill allow for this to be sent from are U.S., UK, Croatia, Denmark, Norway, Sweden, and nearly every country that uses the Euro.


Will sell at the Bitstamp spot rate, converted to your currency using rates if you are sending from other than U.S.

PM me for more.
145  Economy / Service Announcements / Re: [ANN] - a location-based bitcoin to cash marketplace on: May 05, 2014, 11:29:29 AM
Last update 16 hours ago:

We are restoring the site and you can log in already. Some contacts might not yet be available. Transactions are delayed.

Looks like they re-opened prematurely .... seeing sluggish performance, getting HTTP 500 errors, etc.
146  Bitcoin / Bitcoin Discussion / Re: re-use of addresses on: May 04, 2014, 10:33:57 PM
ok, so I understand that you shouldn't re-use an address

GreenAddress just wrote a blog post on address re-use:

But this view is not universal, apparently:

Attention #Bitcoin : contrary to what USG moles are peddling, NOT REUSING ADDRESSES IS BAD FOR YOUR PRIVACY.

and then:

which I read but still have no idea why Mircea would make that claim.

147  Economy / Service Announcements / Re: [ANN] - a location-based bitcoin to cash marketplace on: May 03, 2014, 07:32:44 PM
There is no information out-of-band

Just a few minutes after I posted that, there was a blog post and Twitter status update -- so LocalBitcoins did address the outage out-of-band eventually.

As far as what happened:

LocalBitcoins received a very dangerous attack against the site infrastructure
The site will be down for a while as the system is being rebuilt

148  Economy / Service Announcements / Re: [ANN] - a location-based bitcoin to cash marketplace on: May 03, 2014, 07:20:50 PM
Any suggestions are welcome!

The site is currently offline (no response when accessing the site).    There is no information out-of-band, such as a message on a site (hosted separately), or an acknowledgement of the issue here in this thread, and/or on Twitter:
149  Bitcoin / Bitcoin Wallet for Android / Re: BlackBerry BB10! on: April 25, 2014, 02:26:59 AM
Nothing terrible that it's a bit of an outdated version. Thanks!

Now that BB10 v10.2.1 can install an Android .apk directly, has anyone tried doing that yet with the Android version?

150  Bitcoin / Bitcoin Discussion / Re: Domain name Escrow service to accept Bitcoin and Litecoin on: April 24, 2014, 07:14:07 PM
now accepting payments via both Bitcoin and Litecoin.

Only half way there.  They accept payment in Bitcoin:

But disbursement to the seller apparently must be in fiat:

151  Local / Marketplace (India) / Re: WTB: gift certificate (INR) on: April 24, 2014, 06:32:26 PM
I'm looking to add 3,000 Rs again (21-Apr-2014).

I have acquired a gift card successfully again through a trade here.

I continue to need this about once a month so will update here the next time I'm looking for more rupees.
152  Local / Portugal / Re: Mycelium Bitcoin Wallet in Portuguese on: April 23, 2014, 02:23:12 PM
Our initial focus is Chinese, Spanish, German, Russian, and Portuguese.

Looks like additional translations are now being supported.

From a post in this Issue entry on GitHub, translation contributions for Mycelium are made using Crowdin (by invite only though).
153  Bitcoin / Alternative clients / Re: Mycelium Bitcoin Wallet on: April 23, 2014, 11:06:09 AM
I'll be giving [packaging the APK for BlackBerry 10] another try in a few days when I have access to a Windows system.

I never did end up trying to build that package for BlackBerry 10 (due to lack of access to a system running Windows).

Now that my mobile provider (T-Mobile) has made an OTA update of BB10 to v10.2.1, I can now install the Android .apk directly without it being packaged for Blackberry 10.

So I did that app installation using the .apk right from the website.

I did first need to change the setting to allow apps from outside BlackBerry World to be installed (Settings -> App Manager -> Installing Apps, then set the "Allow Apps from Other Sources to be Installed" slider to "On").

To install, I clicked on the mbw-v1.2.1.apk file after it had downloaded.  The installer then launched which allowed me a one-click install of Mycelium Wallet (for Android) from there.  I don't know why but the value for Version: shows   After installation, the app's About page shows v1.2.1 so it definitely installed the app correctly.

After installation, I had an icon for Mycelium Wallet app.

Using the app I was able to scan a QR code and use most of the app on a BlackBerry Z10 as I normally would on an Android.    

The only real issues I had were minor.  With Local Trader, the app pops up a warning:
"Your device cannot integrate with Google Play Services, and may not get automatic notifications when trade updates occur."  

Also in Local Trader, when I went to change location and clicked on the icon to grab my current location a message displayed:
"This feature requires your device to be able to tell its current location.  It seems that your device cannot do that.  Try enabling location services in your device settings".  
I do have my Settings -> Location Services -> Location Services slider set to "On".  In Application Permissions (Settings -> Security and Privacy -> Application Permission -> Mycelium), there are no settings I can change and the Location does show as "On" (as do all the other permissions -- Shared Files, Device Identifying Information, and Camera).  I resolved this by setting the location manually by clicking the keyboard option and typing in my location and choosing the right city from the list.

There was one other problem I had and that is with doing the backup.  After the backup PDF is created, the Share PDF options include  only Messages and Skype.  Messages is Blackberry Messenger, which I don't have configured and don't use.   I don't have Dropbox on my BB10 device -- that probably would have been an option I would have been given as a backup destination.   I guess I'll use the Skype method.  I would have liked to have been able to maybe save the PDF to the filesystem and manually back it up that way (e.g., with a thumb drive). [Edit: Showing the private key (via Export) and printing that QR code out is a suitable manual method to back up my private key.]

I see that BlackBerry now provides a plugin for use with Android Studio -- so not sure if that helps Mycelium developers [Edit: o any other contributors to the open source project] improve compatibility with BlackBerry 10.
154  Bitcoin / Alternative clients / Re: Mycelium Bitcoin Wallet on: April 23, 2014, 08:42:23 AM
The APK in the play store and on the web-site is the same, and signed under the same certificate.

How long before the version available from the Mycelium website gets updated to the same version on Google Play?
Currently v1.2.0 on the website, v1.2.1 on Google Play:
155  Economy / Trading Discussion / Re: Tips for local transactions on: April 22, 2014, 08:36:21 AM
There is something that has the potential to impact local trading -- the "Replace By Fee" patch (and related "Undo" service BitUndo):

Peter Todd's recent 0-confirm double spends:


Many in-person and online cash trades are settled immediately where the buyer hands over cash after seeing a transaction from the seller to the agreed-upon Bitcoin address.  But after the cash is handed over and the two parties each go their own way, the seller has the potential to reverse the transaction.  This is because with Bitcoin, transactions with zero confirmations are not safe -- until they receive a block confirmation or three (or six, depending on the risk level).

Historically, there hasn't been much "double spending" of zero confirmation transactions, and even significantly less double spending of transactions where there was at least one confirmation.   That's because the behavior of the Bitcoin client typically used by miners only recognizes the first spend and thus attempts to double spend (e.g., via race attack) are ignored.  

However, there is a modification to the Bitcoin client that miners can use that changes things signifcantly.  This change is intended to allow a person spending Bitcoin to submit an alternate of the transaction before the original gets mined such that the original transaction is ignored and the alternate gets included in the blockchain.

So though you as a trader might see a transaction where you receive your bitcoins, the seller could then mess with that transaction sent to you such that it will never confirm.

There is very little mining capacity currently using this modified client so the chances of someone trying to do this has a low likelihood of success.  But that risk exists (as it always has) just that it is now a higher risk.

A trade using LocalBitcoins doesn't have this issue because the coins are escrowed and then released into the user's E-Wallet with LocalBitcoins (i.e., trades on LocalBitcoins don't go through the blockchain).

Mycelium now has a "Local Trader" feature in which the risk can be lessened thanks to trader history ratings as well as a unique Transaction Confidence approach in which the network is probed to discover double spend attempts and the user is warned when transactions have a higher risk of being double spent (e.g., when they rely on other zero-confirmation transactions).

Mycelium Local Trader
156  Local / Marketplace (India) / Re: WTB: gift certificate (INR) on: April 21, 2014, 08:56:20 AM
I'm looking to add 3,000 Rs again (21-Apr-2014).

How this works is,
1.) You and I agree on the rate (in BTC) for your 3,000 Rs.  [e.g., ~0.1 BTC if using today's BTC/USD of $500 on BitStamp]
2.) I provide to you my e-mail address.
3.) You buy a 3,000 Rs gift e-card from Milaap, paying with your Netbanking or with an Indian credit card.  Entering my e-mail as the gift recipient.

 -  <-- PM me for my Milaap "lender name and e-mail".

4.) You send to me your Bitcoin address for my payment
5.) I receive the e-mail, redeem the gift e-card, and send to you the bitcoins.

PM me if interested
157  Bitcoin / Bitcoin Discussion / Re: A successful DOUBLE SPEND US$10000 against OKPAY this morning. on: April 12, 2014, 05:52:18 PM
I think of a double spend as a spend with confirmation followed by another spend of the same balance.

Which is what happened in March, 2013.  If you were using the v0.8 client there was a transaction that had more than six confirmations but later the fork which pre-v0.8 clients were mining surpassed the one the v0.8 were using and that transaction became invalid.  What happened was a user noticed the fork, created a new transaction that spent the same funds, used a custom client that repeatedly broadcast the double spend attempt and eventually that new transaction got included in the pre-v0.8 blockchain fork.

So yes, a double spend of a transaction that had six or more confirmations on what was at the time the longest chain is something that has occurred.

The gist of the problem was that miners starting up with the v0.7 client had an empty memory pool and thus no knowledge of the transactions that had already confirmed in the blockchain fork mined by the v0.8 clients.  So then it simply is a race -- whichever transaction (of the two that were spending the same coin) that reached those miners first is the one that was being hashed.   For that specific weakness, there are solutions that had been discussed but not implemented as far as I know.  For instance, when the miner is shut down the unconfirmed transactions in the memory pool could be written to the filesystem and then those transactions get loaded first when the miner starts back up.   That would likely have made the result of that March 2013 fork be that no double spends had occurred.
158  Economy / Trading Discussion / Re: Tips for local transactions on: April 08, 2014, 07:27:16 PM
One resource available to those who want to do a trade locally but don't want to physically deliver the cash is a courier service.  But handing over an envelope full of cash to some kid on a bicycle might not seem to the most prudent move.

However, innovations from Uber (with Uber RUSH) and Postmates make it so that their courier / messenger services work fairly well for this task.

Here's a reddit post with a few more details on this:

And here is a forum post describing another type of courier method, one that is less expensive than an Uber RUSH type of messenger service:
159  Economy / Trading Discussion / Re: Local Delivery For Bitcoin Trades on: April 08, 2014, 05:50:30 PM
And now in Manhattan is Uber's - Uber RUSH messenger service:


What's awesome about this is that the location (tracking) is available to the sender, but that ETA/Location info can be shared with the recipient.

Additionally, by default the messenger will take a photo of the recipient's ID (Driver's license or passport).   Though for privacy reasons this might not be what the recipient wants and the sender can request that the item can be delivered to the named party with no ID verification.
160  Local / Other languages/locations / Re: Việt (Vietnamese) on: March 27, 2014, 07:02:41 AM
via Google translate:
Trao đổi Bitcoin đầu tiÍn của Việt Nam

There is an exchange now in Vietnam:


Press release:
Bitcoin Vietnam Co. Ltd. and Bit2C Ltd. announce cooperation for Vietnamís first live trading Bitcoin exchange
 - (Browser friendly PDF viewer)

Pages: « 1 2 3 4 5 6 7 [8] 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 ... 457 »
Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!