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    Item type:Publication, Access status: with files ,
    A blockchain-based IoT data marketplace
    (Springer, 2023-12)
    Sober, Michael Peter
    ;
    Scaffino, Giulia
    ;
    Schulte, Stefan
    ;
    Kanhere, Salil
    The (IoT) is growing steadily, and so is the number of data that is generated by (IoT) devices. This makes it difficult to find and leverage relevant data (and data sources) without a data marketplace. Such a marketplace provides a platform to enable different parties, e.g., sensor operators and service providers, to trade their data. Today, most data marketplaces are based on centralized solutions, which may become a single point of failure and come with expensive infrastructure, trust problems, and privacy issues. Therefore, we propose the application of blockchain technology to implement a data marketplace for the IoT. Within the proposed marketplace, smart contracts are used to implement various functionalities and enforce the rules of the data exchange. The marketplace also includes a proxy, a broker, and (GUIs) to enable data trading. To show the applicability of the proposed data marketplace, we analyze the costs arising from the utilization of smart contracts.
    Publicationtype: Journal Article
    Scopus© Citations 6  108  139
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    Item type:Publication, Access status: with files ,
    Decentralized cross-blockchain asset transfers with transfer confirmation
    (Springer, 2023-08)
    Sober, Michael Peter
    ;
    Sigwart, Marten
    ;
    Frauenthaler, Philipp
    ;
    Spanring, Christof
    ;
    Kobelt, Max
    Today, several solutions for cross-blockchain asset transfers exist. However, these solutions are either tailored to specific assets or neglect finality guarantees that prevent assets from getting lost in transit. In this paper, we present a cross-blockchain asset transfer protocol that supports arbitrary assets, is adaptable to different means of cross-blockchain communication, and adheres to requirements such as finality. The ability to freely transfer assets between blockchains may increase transaction throughput and provide developers with more flexibility by allowing them to design digital assets that leverage the capacities and capabilities of multiple blockchains. We define the general requirements and specifications for a cross-blockchain asset transfer protocol and provide a proof-of-concept implementation for EVM-based blockchains. Further, we evaluate the protocol concerning costs, transfer duration, and security.
    Publicationtype: Journal Article
    Scopus© Citations 6  110  605