Hm, came here due to the Ethereum - Tau Article on The Cointelegraph.
I read the article but I don't see an advantage on the userside compared to any smart contract form, Ether or the proposed BTC smart conracts.
I also don't quite understand how the MSCTAU I might buy are really mine in terms of having the private key for the address...compared to every other presale I experienced.
The CT article indeed doesn't get into the fine details. Please have a look at the docs and ask any question.
The coins (which are intermediate only) are over the Omni (aka Master) protocol. They are encoded over the Bitcoin's blockchain, and you store your coins in a BTC address, with same privkey/pubkey, ownership, transferring, and everything else as in cryptocoins.