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61  Economy / Web Wallets / Re: - Bitcoin Block explorer & Currency Statistics on: October 19, 2013, 06:34:30 PM
Does this imply that you only "mix" your coin with people also trying to mix them in those 40 seconds?
i.e. it works much better within peak activity?

As the transactions are large and incur high network fees, paid by the operator, there is an advantage to the operator to have multiple participants in one transaction.

But for users themselves as long as the coins in the sharedcoin wallet are being consistently swapped with fresh coins (tainted by many sources) it doesn't necessarily matter if another user is directly involved in your transaction or not. In fact the server can provide better anonymity (see below).

Is it important to use whole increments (like 0.1 BTC) when using this? If so, you should enforce that in the user interface.
(if you can send arbitrary amounts, that's cool, I don't know how this works)

Only if you are mixing with other users who want to send different amounts. When mixing with the sharedcoin pool the server doesn't desire any particular output size so can deliberately add input and output combinations which mimic your own. Then when you include randomised fees into the mix it makes it almost impossible to determine the inputs used from the value of one output.

Cool! Does it allow other users not using to join a coinjoin transaction?

Yes there will be a browser extension available which you can input a private key.
62  Economy / Web Wallets / Re: - Bitcoin Block explorer & Currency Statistics on: October 19, 2013, 11:53:52 AM
Sharedcoin trustless mixing now available for testing

Sharedcoin uses a technique known as coinjoin to provide coin mixing without needing to trust any third party with your funds. The service still relies on a centralised server but that server only co-ordinates transactions without any funds passing through it. The main advantages are significantly less risk for both the user and operator and no requirement to keep any logs.

Anyone interested in testing can login using the following link:

Please test with small amounts only (0.5 BTC max). 0.1 BTC is the minimum send amount. If you experience any errors please record the output from the javascript console.

The current client stages are:

- The client will submit its "offer", which is the inputs it wants mixing and the desired outputs.
- The server waits a certain amount of time for other clients to submit their offers.
- The server combines everyone's offers and creates a "proposal".
- The clients check they are happy with the proposal and signs their inputs.
- The server submits the final transaction.

The entire process takes about 40 seconds.

Features currently supported:

- Variable number of inputs and outputs per client
- Variable input and output values.
- Randomised fees.
- Ability to draw upon reserve funds when no other participants are available for mixing.
- Taint analysis determines the appropriate inputs to mix.

Features planned:

- Multiple iterations using temporary addresses never saved inside wallets.
- Better randomisation of change outputs and splitting of outputs between multiple iterations.
- Better progress indication.
- Documented Client APIs and SDK.

Example sharedcoin transaction:

The amount currently available in the reserve pool is low, this will be gradually increased over time but during the testing phase if anyone manages to manipulate the client to withdraw excess funds from the pool they can keep that amount.

Client source available at:
Server status can be viewed while testing at:
63  Economy / Web Wallets / Re: - Bitcoin Block explorer & Currency Statistics on: October 19, 2013, 10:40:50 AM
it's under security options, you can lock the IP addresses that are allowed to connect to your wallet.  This historically has never affected the android app, but it appears to do so now.

This should be fixed now.

Any chance you could add a $ approximation to the miner's fee on the custom send money page.

This will be available next update. Btw you should get a warning if trying to send with a fee above 1 BTC, perhaps the warning should be lowered to 0.1 BTC.

Not 100% sure, but with the new chrome app, the inactivity timeout logout doesn't seem to work.

Will be fixed next update as well.

What happened with Firefox browser extension?

I'm having trouble getting it re-approved into the extension store. For now it can be downloaded directly from here

The mining profit and electricity consumption stats are said to be based on electricity consumption of 600 w/gigahash. This is out of date by factor of at least  100 . Can you update? (Block Erupters are about 7.5 w/ghs and some of the newer ASICS are under a watt). Otherwise the false impression is being given that the network is hugely inefficient in terms of electricity consumption, which is unfortunate.

The electricity cost on the existing chart could either be changed a certain date when the first ASICs became available (1st Feb 2013?) or a new chart started for only ASICs . Not sure which would be better.

Inspecting with you can see that no "strict-transport-security:" is set when you type

It is only set on wallet pages e.g.

Feature suggestion - using compressed public keys by default

The out of date iPhone app doesn't support compressed public keys which is preventing them from being made default. When the app is finally updated  this can change.


Update for the Mac OSX client available in the app store
64  Economy / Web Wallets / Re: - Bitcoin Block explorer & Currency Statistics on: October 14, 2013, 09:04:59 AM
Do you read as google bot? searching for specific keywords?
Javascript error doesn't mean you need to start panic  Wink

Yep, no need to worry.

TheButterZone, there is some problem decoding the mnemonic but i'm not sure the exact cause. If your not able to login into the wallet another way the please open a support ticket and i'll take a look as soon as possible. If you are able to login note down a new mnemonic and test into on the recover-wallet page.
65  Economy / Web Wallets / Re: - Bitcoin Block explorer & Currency Statistics on: October 14, 2013, 02:23:36 AM
"URIError: malformed URI sequence" in a gray box under it.

Could you check if there are any errors in the javascript console. Otherwise open a ticket and I'll take a look further.
66  Economy / Web Wallets / Re: - Bitcoin Block explorer & Currency Statistics on: October 13, 2013, 11:52:26 PM
SMS "payment received at this watched address" alerts not going out?

Are you getting alerts through other methods (i.e. email alerts)?


New method call to create wallets programatically -

By passing in a pre generated private key you can deposit and withdraw funds directly to the wallet using the wallet api or an external client. Request an API code here:

67  Economy / Scam Accusations / Re: - SCAM, lost 1000$ on: October 13, 2013, 10:35:05 AM
The coins were sent to an expired shared send address. The coins were refunded back to the sending address.
Login to wallet2 and the coins will be there.

A mistake was made with the correct refund address (copy and paste error!). A new refund has been issued.
68  Economy / Service Discussion / Re: My Wallet "Insecure Alias" on: October 13, 2013, 01:59:26 AM
today I have also problem account not login and again and again error for changing identifier as I try to recover or click for support page  502 not gateway message what the hell is going here

What browser are you using? It it possible you could screenshot the error and either post it or PM it to me.
69  Economy / Web Wallets / Re: - Bitcoin Block explorer & Currency Statistics on: October 12, 2013, 12:28:36 AM
Please enable HSTS to avoid sslstrip or a MITM replacing the http page.

70  Economy / Service Discussion / Re: How are double spends and dropped transactions represented BlockChains API on: October 11, 2013, 05:55:05 PM
I am currently using Blockchain's API to do payment verification with, but have a few questions.

How i am using it (i think it i am using it in the right way....):

i am issuing a new/clean address to for each sale.
i am then checking the balance of the address and the transactions (tx->out) to get the time of the transaction, the value and the blockHight (of which i am using to get the confirmed count from)
i then add the transaction details to my DataBase/System and display the relevant message to the user.
an ustomated script then runs to collect/update the confirmed count (and updates this info into my DataBase).
I have been building this by making bitcoin transactions to myself, but of course all my test transactions are genuine, so i dont know how "bad" transactions will be represented!

What i am unsure on, is how will double spends (or dropped transactions/spends/fraud) be represented? Will the transaction simply disappear? and will this then effect the Balance shown against the address? or will the blockHeight simply change to 0/NULL?

Any advice on this would be greatly welcomed!

Best Regards Ford

If there are two competing unconfirmed double spends will display one transaction it predicts will confirm first.

If a transaction is successfully double spent (i.e. its competing transaction confirms first) then it will simply disappear from the transactions list. If you are checking for 6 or more confirmations this shouldn't ever be a problem.

Have you considered using rather than polling address balances?
71  Economy / Service Discussion / Re: My Wallet "Insecure Alias" on: October 11, 2013, 04:20:25 PM
If I understand correctly, then I can't access my blockchain mobile wallet via web client since it's not associated with any email address?

You can but you must copy over the full wallet identifier which can be found list at the top of Account Settings on the android or iphone app.

Alternately you could add an email temporarily to receive the welcome message, which can be used to login on your PC, then afterwards remove the email.
72  Economy / Web Wallets / Re: - Bitcoin Block explorer & Currency Statistics on: October 11, 2013, 03:54:47 PM
On one of my computers, a MacBook Air 10.8.5 with Chromium Version 22.0.1215.0 (147829) I get this error:

This application is not supported on this computer. Installation has been disabled.

Are you able to update chromium? In not sure what the minimum required version is but the latest is 30.0.1599.69.

Is there some way to access them, or do I have to pull a list of all my addresses and somehow generate it from the blockchain itself?

I've improved the pagination controls in the web interface now, you should be able to navigate to the last page easier. The android app still only displays one page at the moment.


Change to API request limits.

The API request limits have been doubled to a maximum burst of 2 requests per second over a 5 minute interval and 1 request per second over an hourly interval.
73  Bitcoin / Bitcoin Technical Support / Re: Blockchain receive API and CloudFlare on: October 10, 2013, 04:25:55 PM
I know, I double checked their address in Callback URL and the one in my files. Now also made that array with 4 more addresses which I used yesterday for testing and same results.
Why can't fire test callback also, related?

When you use the test callback what is the error given?
74  Bitcoin / Bitcoin Technical Support / Re: Blockchain receive API and CloudFlare on: October 10, 2013, 11:39:15 AM
For sure didn't exceeded limit... This is what I get on while testing. Now my host has changed something (don't know what yet, I guess only enabled it from logs) and I am not  getting that error anymore.

..but on "Fire Test Callback" I do get this response: "Error Sending Notification". Check Callback Response Log: Incorrect Receiving Address (the one in their callback URL is same as in my files).

The thing is I am moving my website to another server and my code worked on previous server so I am not sure where is the problem. Money is being forwarded when paying on website but I can't debug why callback doesn't work..

"Incorrect Receiving Address" is an error generated by the php example (callback.php line 19).

if ($_GET['address'] != $my_bitcoin_address) {
   echo 'Incorrect Receiving Address';

If you have changed bitcoin addresses (or have multiple addresses) you will need to do something a long the lines of:

$my_addresses = array("1MyAddress", "1MySecondAddress");
if (!in_array($_GET['address'], $my_addresses)) {
   echo 'Incorrect Receiving Address';
75  Economy / Web Wallets / Re: - Bitcoin Block explorer & Currency Statistics on: October 09, 2013, 08:35:02 PM
i'm not able to look up address balances.

Any error message?

I don't seem to be getting notifications when newly minted coins are transferred to one of my addresses, works fine for normal transactions.

I'll look into this. Coinbase transactions are handled differently than regular transactions so there could be an issue.

Was working fine this morning, and now this.

Should have been fixed last night.

Annoying niggle in the Android app - clicking the transaction has in the transaction popup sends you to an address with https:/ instead of https:// - which for me defaults to a Google search instead.

I'm not able to replicate this, what version of the app are you using?

Lastly, I used to be able to add a label to an address by choosing the transaction - is this still possible? I get the impression the "add note" button adds a public note instead?

It adds a private note to the transaction (stored client side). The only way to add an address label at the moment is to copy the address to clipboard, open the address book, swipe to "sending addresses" and choose "paste sending address". The other way was much easier, I'll look at adding it back in.


New Chrome Extension

A new version of the chrome browser extension is available here. Due to a change in the way it is packaged it must be submitted as a new extension so existing users will not get automatically upgraded. It now launches in a dedicated window and has improved multi language support. The new packaging also allows access to the chrome usb interface which can be used to support hardware wallets like trezor.

76  Bitcoin / Bitcoin Technical Support / Re: Blockchain receive API and CloudFlare on: October 09, 2013, 07:53:21 PM
Anyone had problems with those two ? Getting this:

Error Response 403 body:
Error 1010
Access denied
What happened?

The owner of this website ( has banned your access based on your browser's signature (xxx).

Is it possible to avoid it? I don't want to fully trigger off my cloudflare protection.
Thanks in advanced

Cloud you PM me your ip address.

You should normally only receive this error if you have vastly over exceeded the request limits.
77  Economy / Web Wallets / Re: - Bitcoin Block explorer & Currency Statistics on: October 08, 2013, 03:35:14 PM
"We're sorry, but we can't find what you're looking for."

I am wondering if the extension is still maintained and secure to use.

It is still being maintained. The not found error is a bug in the extension gallery. Unfortunately it will take mozilla 2-4 weeks to review the update before it will be available again.

The latest xpi is available here:

Hi piuk, apologies if this has been asked before but how is the websocket API implemented and is it open sourced somewhere?  If not, would you consider open sourcing it?  I'd like to host my own version of it.

It currently not open source. You could use Bitcoinj and tomcat (with built in websocket support) to create your own version.

Since you (piuk) are considered as a reliable person, are you thinking to become also a gateway for the Ripple network?
Users will need to move their Bitcoin to temporary btc addresses owned by you (, and then you will move IOU BTC to the Ripple addresses of users.

I believe the plan for the moment is to be exclusively Bitcoin, this could certainly change in future.

Chrome Blockchain App updated to 3.0.2.  Can we get a list of changes made?

It incorporates changes from this commit:

No end user changes.

- Added Filersaver.js for better cross browser support when downloading wallet backups client side.
- For authentication rather than the sharedKey being passed in full each request it is now hashed using a TOTP scheme, that way if it was intercepted for any reason (no SSL) it is valid for only a few seconds. As a side effect the javascript client now syncs with server time when the wallet is opened.
78  Bitcoin / Bitcoin Technical Support / Re: Blockchain Receive API not sending callbacks. on: October 07, 2013, 10:23:17 PM
Yup.  Error No Log Entries Found

Please post or PM me your domain. No callbacks exist matching
79  Bitcoin / Bitcoin Technical Support / Re: addmultisigaddress or createmultisig - with RPC API? on: October 07, 2013, 01:45:28 PM
The RPC api doesn't support multisig at this time. For multisig support you will need to setup a local Bitcoin-Qt RPC server (
80  Other / Beginners & Help / Re:, my alias doesnt seem to work on: October 07, 2013, 12:01:35 PM
If you haven't already please open a ticket at with your alias. Since i'm online now i will try and answer immediately.
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