language more than they are b…tination addresses that they are sent to, this is a challenge worthy of an academic research paper. In an account-based model, this can be implemented in 20 minutes of coding time via a smart contract that simply implements the rules directly. Restricting asset ownership to a specific set of parties (eg. KYC’d users) is another example which can be managed with some complexity with covenants, but which is a simple code writing exercise in a smart contract account-based model. It is worth noting that these are advantages of a stateful scripting language more than they are benefits of accounts vs UTXOs; without a stateful scripting language (eg. in NXT) account-based models also cannot easily do any of this. However, the notion of a statically addressable object makes the logic around implementing these stateful systems in practice much simpler and more developer-friendly.