Zcoin (XZC) is proud to be the first coin to have a working prototype implementation of the MTP proof of work! MTP has been launched on our testnet and there will be a period of testing where we fix bugs and finalize the parameters.
Solo mining already works through the inbuilt miner (setgenerate true) and djm34 is working on a GPU implementation of the miner.
For those of you who code, you can participate in the test through our Github on the MTP branch here: https://github.com/zcoinofficial/zcoin/tree/mtp. We are aware of some bugs and are working to fix them so the code will still be rapidly changing. Note that there may be numerous restarts on the testnet. Remember after compiling to run it with the -testnet flag or define it within zcoin.conf!