I want to write own GPU miner(Please, don't ask me why :) , but i can't find any simple solution (cgminer and RPC miner is big projects with many useless to me functions), i need sources of only a GPU ...
To make those who not familiar with C++ to understand the algorithms.
I would like to send transactions with messages as described in the wiki. In Transaction with slightly changed script is never relayed, someone answered that non-standard transactions are not relaid ...
What does the main.cpp source-code file do? I know what main.cpp files are for in general, but specifically in the case of bitcoin?