IOHK | WHY WE ARE BUILDING CARDANO | 06/28/2017    The value ledger is called the Cardano Settlement Layer (CSL). As the purpose is to account for value, the roadmap has the following goals: 1. Support two sets of scripting languages, one to move value and another to enhance overlay protocol support 2. Provide support for KMZ sidechains to link to other ledgers 5 3. Support multiple types of signature including quantum resistant signatures for higher security 4. Support multiple user issued assets 5. Achieve true scalability, meaning as more users join, the capabilities of the system increase Scripting Starting with the scripting language, transactions between addresses in a ledger require some form of a script to execute and be proven valid. Ideally, one would not want Eve to access Alice’s money, nor would one want a poorly designed script to accidently send value to a dead address making the funds irretrievable. Systems such as Bitcoin provide an extremely inflexible and draconian scripting language that is difficult to program bespoke transactions in, and to read and understand. Yet the general programmability of languages such as Solidity introduce an extraordinary amount of complexity into the system and are useful to only a much smaller set of actors. Therefore, we have chosen to design a new language called Simon in honor of its creator 6 Simon Thompson and the creator of the concepts that inspired it, Simon Peyton Jones. Simon is a domain-specific language that is based upon Composing contracts: an adventure in financial engineering . The principal idea is that financial transactions are generally composed from a collection of foundational elements . If one assembles a financial periodic table of elements, then one can 7 provide support for an arbitrarily large set of compound transactions that will cover most, if not all, common transaction types without requiring general programmability. 5 Coming soon in a paper from Kiayias, Zindros and Miller 6 Specifics will be released in an upcoming specification. The full language will be supported in the Shelley CSL release planned for Q4 of 2017 7 Project ACTUS has an in-depth elaboration WHY WE ARE BUILDING CARDANO  Creative Commons Attribution 4.0 International License Page 9 of 44