Creating a specialized listener

[dingrite]

My goal is to create a bot that would listen to the bitcoin network for a list of specific transactions associated with specific bitcoin addresses.

To achieve this I figured it would be best to query the network for the latest blocks, verify them and look for the transactions there.

Does anyone know how I could best do this? A high level description would do.

And I assume libbitcoin is the best cpp lib out there?

[doof]

Depending on your coding skills this is very easy. 

Call api such as http://blockchain.info/api/blockchain_api

Do your logic

Pause, Repeat.

[dingrite]

Thank you but I forgot to mention I do not want to rely on any static source(s).

I want to bootstrap into the p2p network and pull the info out of there.

I also don't want to store the whole blockchain in the process but only the last N blocks. Also the possibility of offline time is possible so it should be able to somehow query only the last N blocks even if the last block it has is N+x (x>0) away.

Sorry I wasn't clearer, I was in a bit of a hurry.

[elbandi]

My goal is to create a bot that would listen to the bitcoin network for a list of specific transactions associated with specific bitcoin addresses.

To achieve this I figured it would be best to query the network for the latest blocks, verify them and look for the transactions there.

Does anyone know how I could best do this? A high level description would do.

And I assume libbitcoin is the best cpp lib out there?

https://code.google.com/p/bitcoinj/wiki/UsingFromOtherLanguages
here is a sample:
https://github.com/mikehearn/cppjvm/blob/master/mytest/bcj-hello-world.cpp

[dingrite]

My goal is to create a bot that would listen to the bitcoin network for a list of specific transactions associated with specific bitcoin addresses.

To achieve this I figured it would be best to query the network for the latest blocks, verify them and look for the transactions there.

Does anyone know how I could best do this? A high level description would do.

And I assume libbitcoin is the best cpp lib out there?

https://code.google.com/p/bitcoinj/wiki/UsingFromOtherLanguages
here is a sample:
https://github.com/mikehearn/cppjvm/blob/master/mytest/bcj-hello-world.cpp

Thank you but I am looking for a C/Cpp implementation, I do not like java dependency and the bot need be able to run without a potential JVM bottleneck. It will be performing a lot of cryptography and many instances may have to be run.

[wiggi]

a bot that would listen to the bitcoin network for a list of specific transactions associated with specific bitcoin addresses

Patch the Qt-client. Take a look at the console commands (getrawtransaction etc),
everything you need is already there.

[cnk]

My goal is to create a bot that would listen to the bitcoin network for a list of specific transactions associated with specific bitcoin addresses.

There is a pull request that adds support for watch-only addresses to bitcoind : https://github.com/bitcoin/bitcoin/pull/2861. This PR allows to track transactions and balances without having to know and keep associated private keys in the wallet. Unfortunately, it is unclear when it will be merged.

It is also reported that people are using this in production (custom version of bitcoind).