Currently I am working on a Web-of-Trust implementation for the OpenPGP library PGPainless. Technically, the WoT consists of a graph where the nodes are OpenPGP keys (certificates) with User-IDs and the edges are signatures. In order to be able to create a WoT, users need to be able to sign other users certificates to create those edges.
Moxie Marlinspike gave a talk at 36C3 that misrepresented decentralized systems. This is my opinion regarding his arguments.