Blockchain.info - Bitcoin Block explorer & Currency Statistics

[P_Shep]

Is it possible to request data through the API on an address, but without all the tx's?
That's quite a lot of data there I don't need.

No?

[piuk]

I do have the "My Wallet Chrome App" installed but it doesn't seem to do anything other than load the blockchain.info webpage.  Blockchain.info isn't listed in the google Drive Apps despite me giving it permission.

Maybe try and uninstall and re-install the app from chrome (only the latest version has the Google drive flag).

No reason to get fancy just have a Verify button.

Aye Aye.

Sent a donation this is really shaping up to be a solid platform. 

feature requests:
a) can you include a setting where the wallet will auto-backup to email whenever a new private key is imported/created?
b) on the send payment screen can you include a "total" (for send many payments) and a "remaining balance" display.
c) I like the idea of using google authenticator but how about an option for only requiring it on a system you haven't logged in from (and then cache it for 90 days).

Thanks for the donation.

a) Should already be that option in Account Details
b) Nice idea, can do.
c) Unfortunately it's not possible to do this with the current wallet format. Everything is cantained within one file which the client downloads and decrypts, two-factor authentication can't happen after the wallet is downloaded as the attacker could just extract the private keys and move them to a different client.

would it be possible for all Ozcoin links on blockchain.info be changed to https://ozcoin.net please

Updated, will change after cache clears.

Is it possible to request data through the API on an address, but without all the tx's?
That's quite a lot of data there I don't need.

Which call are you using?

[P_Shep]

Is it possible to request data through the API on an address, but without all the tx's?
That's quite a lot of data there I don't need.

Which call are you using?

Just what it say in the API doc...

Currently: /rawaddr/$bitcoin_address

The other (/address/$bitcoin_address?format=json) prints the same.

[elgreco]

I haven't been able to get the blockchain app working since I upgraded my iPad and 4s with 5.1.1 and the absinthe JB. Is anyone else having this problem?

[Red Emerald]

I haven't been able to get the blockchain app working since I upgraded my iPad and 4s with 5.1.1 and the absinthe JB. Is anyone else having this problem?

It's been mentioned in another thread

So now that 5.1.1 is jailbreakable untethered for the 4S, I went ahead and updated.  The app store version was working except the profile page didn't have my email or settings in it (only the wallet identifier was shown).  I uninstalled the app store version and installed the Cydia version, but it crashes immediately.  Any ideas?

The Cydia app is working fine for me, but I'm still on 5.0.1 (iPhone 4).  I was going to upgrade to 5.1.1, but I've started using the app more and I don't want to update if it's not going to work.

Wait to upgrade; the Cydia app isn't working for me either.

Thanks.  Sorry you had to be the guinea pig on this.

[P_Shep]

So I've added a new page to Anubis to retrieve balances from blockchain.info. All I display is BTC received, sent and current balance. The rest is wasted bandwidth for us both.
Could you add an API which returns the minimal data?

[piuk]

I've received a few reports of the iOS app crashing using the new 5.1 jailbreak. I'll look into it soon, is http://greenpois0n.com/ the genuine unlock tool?

Could you add an API which returns the minimal data?

You can add a limit 0 parameter to address results e.g.

https://blockchain.info/address/126vMmY1fyznpZiFTTnty3cm1Rw8wuheev?format=json&limit=0

Does that still contain the information you need?

[R-]

Important question to Ben
Why are you such a champ?

[minimalB]

is http://greenpois0n.com/ the genuine unlock tool?

For 5.11 jailbreak i believe Absinthe v2 is best at the moment.

Here is very nice jailbreak wizard for all iOS devices:
http://www.iclarified.com/jailbreak/

Thanks for looking into it!

[P_Shep]

Could you add an API which returns the minimal data?

You can add a limit 0 parameter to address results e.g.

https://blockchain.info/address/126vMmY1fyznpZiFTTnty3cm1Rw8wuheev?format=json&limit=0

Does that still contain the information you need?

Perfect!

I didn't see this limit in the docs (at least not where I was looking).

[2weiX]

I have the blockchain app installed and have imported a whole list of vanity-adresses for some purpose or other.


REQUEST:
It would be nice to be able to view the current balance / total received / total sent of all adresses in the adress book, kind of like in blockexplorer (it seems blockexplorer and blockchain.info calculate differently).

[piuk]

Important question to Ben
Why are you such a champ?

Haha thanks. I'm just passionate about bitcoin.

For 5.11 jailbreak i believe Absinthe v2 is best at the moment.

Ok thanks, got my iOS 5 jailbroken and believe I have found the issue.

REQUEST:
It would be nice to be able to view the current balance / total received / total sent of all adresses in the adress book, kind of like in blockexplorer (it seems blockexplorer and blockchain.info calculate differently).

Balances in the sending or receiving address book? Can you point me to an address where there is a discrepancy between block explorer and blockchain, might be a bug.

----------------

Scheduled Maintenance

My hosting provider has informed me that scheduled maintenance is planned for the 1st and 2nd. Although they have allocated 6 hour window I have been informed the downtime should be longer than 15 minutes.



Security Overview

After the recent bitcoinica incident I've been thoroughly reviewing the server side security at blockchain. Obviously blockchain has a fundamentally different security model to bitcoincia but regardless no chances are been taken.

Although cloud servers are great for many reasons I think the Linode/Rackspace incidents have proved when it comes to handling sizeable sums of money there are just too many variables beyond you're control to be secure. Blockchain.info runs on privately owned dedicated hardware, a Brief overview of the setup is available below and I'm happy to answer any questions.
 
http://blockchain.info/security_overview.pdf

[HostFat]

Balances in the sending or receiving address book? Can you point me to an address where there is a discrepancy between block explorer and blockchain, might be a bug.

example:
https://blockexplorer.com/q/addressbalance/1HostFatgTXWdRmVoneC8M6ErhiuQ7An5o
It showes: 2.0936819
http://blockchain.info/q/addressbalance/1HostFatgTXWdRmVoneC8M6ErhiuQ7An5o
It showes: 209368190

[vuce]

Balances in the sending or receiving address book? Can you point me to an address where there is a discrepancy between block explorer and blockchain, might be a bug.

example:
https://blockexplorer.com/q/addressbalance/1HostFatgTXWdRmVoneC8M6ErhiuQ7An5o
It showes: 2.0936819
http://blockchain.info/q/addressbalance/1HostFatgTXWdRmVoneC8M6ErhiuQ7An5o
It showes: 209368190

That is perfectly ok: addressbalance/Address - Get the balance of an address (in satoshi)

[Red Emerald]

Ok thanks, got my iOS 5 jailbroken and believe I have found the issue.

I'm looking forward to the fix.  I had been wanting to send some coins the last few days and using my phone is by far the easiest way; I missed it.

EDIT: and the security doc looks good.  I wasn't expecting the site to be running on 3 mac minis.  Just 1 small thing, "CSFR" should be "CSRF"

[Stephen Gornick]

I see that Blockchain.info uses both Mt. Gox yubikey and Yubico's yubikey.   There's a potential security issue using the default authentication method which uses crc16 and thus a valid looking authorization token can be obtained without having the AES key.

Is Blockchain.info using this crc16 method or otherwise vulnerable to this?
 - http://bitcointalk.org/index.php?topic=85648.msg943612#msg943612

[phelix]

how many blocks does this: http://blockchain.info/q/hashrate   look back?  might be interesting to give the look back as a parameter.   

does it go across retargets?

[piuk]

Is Blockchain.info using this crc16 method or otherwise vulnerable to this?
 - http://bitcointalk.org/index.php?topic=85648.msg943612#msg943612

Honestly I'm not sure. The standard Yubico SDK is used and both the public and secret key part is checked. There has not been any security updates to the SDK recently so I assume it is ok.

 

how many blocks does this: http://blockchain.info/q/hashrate   look back?  might be interesting to give the look back as a parameter.   

does it go across retargets?

It uses the 24 hour avg difficulty (~140 blocks) and it know consider re-targets.

public double getNetworkHashRate() {
   return (getDifficulty() * (4294967296L / (((double)1440 / (double)getnBlocksMined()) * (double)60))) / 1000 / 1000 / 1000;
}

[Aseras]

Is it possible to make unconfirmed/orphan transaction not count as "available" balance for an address?

for instance  http://blockchain.info/address/13TcJozDQMXPatGS8ZdzXnzezLMjxe5DS6

the 4.43922435 BTC balance are all orphaned blocks.

[phelix]

Is Blockchain.info using this crc16 method or otherwise vulnerable to this?
 - http://bitcointalk.org/index.php?topic=85648.msg943612#msg943612

Honestly I'm not sure. The standard Yubico SDK is used and both the public and secret key part is checked. There has not been any security updates to the SDK recently so I assume it is ok.

 

how many blocks does this: http://blockchain.info/q/hashrate   look back?  might be interesting to give the look back as a parameter.   

does it go across retargets?

It uses the 24 hour avg difficulty (~140 blocks) and it know consider re-targets.

public double getNetworkHashRate() {
   return (getDifficulty() * (4294967296L / (((double)1440 / (double)getnBlocksMined()) * (double)60))) / 1000 / 1000 / 1000;
}

thanks.

should you ever get bored a good difficulty estimate would be nice