Oh Ok, this is fine in this case. I just expected that there would be much more blocks, and new ones found regularly, so I thought that something was wrong. Lol, I just mined hundreds of blocks at the rate of 1 block each 3 second or so, difficulty 304 is so low. In contrast, I was unable to mine anything using the wallet's built-in miner. I might leave one mining thread for the testnet network, so developers and testers can experience more realistic behavior when using it. A Testnet explorer would be welcome too. Thank you again for your nodes, and your reply.

If anyone is interested in, I merged the original gatra's miner (rminerd) and the latest dave-andersen's one (fastrie), so anyone can solo mine Riecoins using the optimized algorithm. Here is the rieMiner's GitHub repository.

I heavily simplified and modernized (making it more C++ish) the code. Indeed, the fastrie's code contains many parts of unused or outdated code. In another hand, I am not knowledgeable enough to improve the miner algorithm, so this miner is more a convenience improvement than a performance one.

Currently, you should be able to compile it easily on Linux and Windows. The miner works fine on my computer, and is currently mining blocks, but for some reason, its execution might fail in some computers. Moreover, only the old protocol Getwork is supported. I plan to work on it on September and later to add the GetBlockTemplate (and custom payout addresses) and Stratum (and pool mining as well) protocols support, a benchmark mode (dummy mining at constant difficulty), and fix remaining problems. The Testnet nodes will be very useful for me!