Public governability on digital platform is an affordance effect arising in network structures with a wide participation of citizens. Network platforms provide collaboration based on an institutional form of interaction that is more effective than competitive representation. The digital institutional platform provides principles of equality, indifference, reciprocity and autonomy. A participatory public administration based on cooperation assumes an appropriate technical platform, which should have some qualities of affordance, i.e. the ability to act as a mediator for this type of interaction. The technological component, expressed in the idea of the state as a platform, is characterized by the presence of affordances for cooperation. The technology of blockchain is studied as the example. Blockchain is oriented towards procedural justice, which expresses the technological affordances of cooperation. Procedural justice is ensured by the affordability of technology that is created by blockchain algorithms. The paper compares the corresponding problems of affordance.