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They most likely have an advanced block chain indexing backend. Basically they run a node (most likely bitcoinj with custom code) that listens for blocks from all the connected nodes they have. And on …

http://blockchain.info/api/blockchain_wallet_api The api call to send is: https://blockchain.info/merchant/$guid/payment?password=$main_password&second_password=$second_password&to=$address&amount=$ …

Now test it It's easy to test your Bitcoind configuration settings with a browser, just load up the address of your Bitcoind in a browser like so: http://127.0.0.1:8332. …

There are no fees say if you didn't want to actually move bitcoins in between address. As David Schwartz pointed out, you can have accounts which are basically bitcoin wallet organizers in which you c …

This will allow you to quickly and easily scale your address counts in the event you grow large, Bitcoind does not scale well. … Bitcoind can efficiently detect receives to addresses in wallet. When you use the RPC interface and use the "getnewaddress" command, Bitcoind will store it in it's wallet. …

I think you answered your own question in a way. That command will send from a specified account to an address, I'm sure you don't want to bother with accounts and just send bitcoins. You can send fr …

I've ran tests before on .5 million addresses generated in one afternoon. It fired walletnotify within the milliseconds, no noticeable delay when I sent an amount to a random address. Only noticeable …

With the getbalance command you can specify an account and minimum confirms, I'm assuming my immature balance you mean account balance containing unconfirmed transactions. By default it's at one. get …

Why a server isn't downloading the block chain Something that I've seen happen is that Bitcoind may stop downloading blocks at some point in the middle of the full chain. … You can remedy this by just manually moving a chain you've downloaded onto the server or get more ram (you need more than .5 gb of ram to run Bitcoind anyways). …

Use walletnotify instead of polling. how to do address callbacks? It's basically a argument you can specify and Bitcoin will the specified program upon receiving a transaction (BOTH receives and se …

I've been running into problems with a high-traffic hot wallet, where a single transaction would lock up any input for a block with the spendzeroconfchange disabled. Would it be safe for a service li …

To get the history of incoming and outgoing transactions all you need to do is send "listreceivedbyaddress" command to the bitcoind rpc interface. For more detail see here. …

The Simple Way Just use Bitcoind along with it's walletnotify and blocknotify arguments. See here. As soon as you get a walletnotify, store it in a database and make sure txid is unique. …

A hosted wallet, which will involve a wallet running on a server that has all the wallets is a bad idea in general. People will not feel safe as they have to trust a third party with their coins and y …

It isn't possible with the current version of Bitcoind, Bitcoin-QT is simply a GUI wrapper for Bitcoind so same applies for both. …