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In order to be a useful tool, a Web Warehouse (WW) should take into account the quality of the data it manages and the quality of the services that provide the source data. It should also have enough flexibility to endure the high volatility of web sources. In this work we propose a WW platform that satisfies these two conditions. It manages data and services quality, measuring quality at the different stages of the system life-cycle and at the same time, using these measures as input for information processing. Additionally, the platform achieves flexibility and configurability because it is strongly based on informationprocessing services.

Abstract

During the last years, interoperability has become one of the main challenges within blockchain research as blockchains increasingly require to integrate between each other. Indeed, blockchains work by design in silos of information as interoperability is not a native feature. The main efforts in the field target permissionless blockchains, such as Bitcoin and Ethereum. However, interoperability in permissioned blockchains remains as an almost untouched area of work as they introduce additional requirements focusing on privacy and identity. Although, there are some interoperability solutions for permissioned blockchains, they are either high-level design proposals not providing concrete implementations or focus on interoperability issues between business applications and blockchain platforms. In this paper we propose a gateway-based platform-to-platform interoperability solution for permissioned blockchains, which comprises a detailed solution design and a reference implementation. The proposal was assessed through the development of a social security case study, based on the reference implementation and using two blockchain platforms: Hyperledger Fabric and Corda.