Out of curiosity, how did you actually mine the block? 
Did you just manually construct one, then started hashing until you found a nonce that fit the lowest difficulty and waited until a block had not been found for a while and the difficulty reset before broadcasting? (Possibly having to rehash if a new block was broadcast in the meantime)
Or are you running a more "traditional" mining setup with a CPU/GPU/ASIC miner and just got "lucky" with the TestNet difficulty?
No, this is my own implementation of Bitcoin protocol and since at this point the library part (Bitcoin.Net) is almost finished I'm testing parts that don't have unit tests while improving the API. Did you just manually construct one, then started hashing until you found a nonce that fit the lowest difficulty and waited until a block had not been found for a while and the difficulty reset before broadcasting? (Possibly having to rehash if a new block was broadcast in the meantime)
Or are you running a more "traditional" mining setup with a CPU/GPU/ASIC miner and just got "lucky" with the TestNet difficulty?
It is a modified miner using only 2 of CPU cores and I run it only when I'm trying to create new test vectors like my last commit. I'll probably add GPU support when I start adding GPU support to FinderOuter.
As for difficulty, I'm simply manipulating it to submit my test blocks. I still have to get lucky to find a good block since I don't produce that much hashrate but it is easier.
