  Artificial Intelligence-Generated Content (AIGC) is a rapidly evolving field
that utilizes advanced AI algorithms to generate content. Through integration
with mobile edge networks, mobile AIGC networks have gained significant
attention, which can provide real-time customized and personalized AIGC
services and products. Since blockchains can facilitate decentralized and
transparent data management, AIGC products can be securely managed by
blockchain to avoid tampering and plagiarization. However, the evolution of
blockchain-empowered mobile AIGC is still in its nascent phase, grappling with
challenges such as improving information propagation efficiency to enable
blockchain-empowered mobile AIGC. In this paper, we design a Graph Attention
Network (GAT)-based information propagation optimization framework for
blockchain-empowered mobile AIGC. We first innovatively apply age of
information as a data-freshness metric to measure information propagation
efficiency in public blockchains. Considering that GATs possess the excellent
ability to process graph-structured data, we utilize the GAT to obtain the
optimal information propagation trajectory. Numerical results demonstrate that
the proposed scheme exhibits the most outstanding information propagation
efficiency compared with traditional routing mechanisms.
