Hello,
I am very interested in your project, and ready to provide it.
I delivered a very comparable project 3 years ago here, you can check it:
"Bitcoin Balance Viewer from blockchain"
https://www.freelancer.com/projects/CPlusPlus-Programming-bitcoin/Bitcoin-balance-viewer-from-blockchain/
and Part 2:
"Faster Bitcoin balance lookup"
https://www.freelancer.com/projects/CPlusPlus-Programming/Faster-Bitcoin-Balance-Lookup/
They were developed using C++ for maximum performance, I can do it in .Net no problems.
The main obstacle will be that bitcoin block chain is > 150 GB, it will be hard for me to download that, however, the blockchain format is same for all coins, so I will develop using an altcoin chain, and you will have to work with me testing it on the real blockchain.
Please contact for further discussing the project.
(I specified a proposed milestone breakdown, but I'm open to adjustments)
Best Regards
Khaled