Nano contracts are the smart contracts of Hathor Network. They are in the design phase and will offer greater security as the blueprints will be pre-programmed and exhaustively tested before release. More information is available in the RFC MR-3.
2. How many users own HTR?
Hathor Network implements a transaction model based on UTXO (Unspent Transaction Output) like Bitcoin. In this model, multiple addresses are assigned to each user wallet and user funds are distributed among their wallet addresses. So, in principle, knowing which address of which wallet holds HTR, it would be possible to count the number of users who have HTR. However, the only activities obtainable on-chain are the number of addresses, the date of transactions sent/received, and the value per address. In other words, it is not possible to know which addresses belong to the same blockchain wallet. Consequently, any estimate of the number of users who have HTR is very inaccurate. In fact, although the number of addresses holding HTR can be known, two or more addresses may belong to the same wallet/user.