This chapter intends to formulate, by utilizing the rule of law by design approach, a choice mechanism for blockchain employed for public services and humanitarian purposes to understand the decisions made by the State and international organizations at the macro-level regarding the deployment of the technology such that the purpose and intention behind the employment of blockchain is infused with the spirit of fostering the rule of law for fulfilling public services requirements as well as serving humanitarian causes. It answers the question: What choice(s) does the State need to make when implementing blockchain from the rule of law perspective in a legitimate manner? This analysis will facilitate in understanding what the State may intend for a particular blockchain application to afford for a particular usage which must result in an ex-post legitimacy such that the technological affordances follow the rule of law.