aTLAS: a Testbed to Examine Trust for a Redecentralized Web

The redecentralization of the web introduces new challenges on trusting data from other sources due to many unknown or even hidden parties. An application working trustworthy in a decentralized web must evaluate trust and take trustaware decisions autonomously without relying on a centralized infrastructure. This autonomy and the huge amount of available applications necessitates the web to be modelled as an open dynamic Multi-Agent System (MAS). To evaluate the trust of web agents, the most suitable trust models need to be identified and used. Despite the various trust models proposed in the literature for evaluating a web agent's trust, the examination of them with different scenarios and configurations is not trivial. To address these challenges, we showcase aTLAS, a Trust Laboratory of Multi-Agent Systems which is a web-based wizard testbed for researchers and web engineers to evaluate trust models systematically. aTLAS will enable future research regarding trust evaluations in a decentralized web. We show the different features provided by aTLAS through a set of experiments.