The China National Archives of Publications and Culture serves as the national center for the coordination, collection, research, and information services of version resources, bearing the critical mission of preserving cultural heritage. Digital publications form a significant component of its digital holdings. Research shows that the digital transformation of publications has become a vital pathway for knowledge dissemination; however, it also introduces complex challenges related to long-term preservation, including technological obsolescence, ambiguous copyright ownership, and insufficient value-based management. This study tackles these challenges by proposing a comprehensive technical framework and platform dedicated to the long-term preservation of digital publications, aligning with the strategic objectives of building a digital China and safeguarding national cultural heritage. The platform adopts a multi-tiered architecture referred to as the “Four-Layer Dual-Chain” model, which integrates an access layer, a business layer, a storage layer, and an evidence storage layer, supported by parallel content and rights chains. This structure enables full lifecycle management—from resource ingestion to permanent preservation, and from rights identification to value realization. To address technological obsolescence, a dynamic migration framework has been implemented. This system continuously monitors preservation risks by leveraging globally recognized authoritative format registration repositories such as the PRONOM, GDFR, and UDFR projects, and initiates proactive migration alerts via predictive analysis. Pre-configured migration pathways are equipped with quantifiable fidelity metrics, and all operations are recorded along with technical metadata to ensure content consistency and authenticity through hash-based verification. This strategy transitions the preservation model from reactive rescue efforts to preventive maintenance, thereby countering risks associated with rapid technological evolution as embodied in Moore’s Law. For copyright management, a blockchain-based evidence storage mechanism is established, incorporating dual chains dedicated to rights attestation and access traceability. The rights chain documents copyright information across the entire lifecycle, while the access chain logs all operational activities. A three-tier verification mechanism—comprising source authentication, rights validation, and behavior auditing—guarantees content integrity and supplies legally valid evidence for copyright disputes. This infrastructure is consistent with judicial recognition of blockchain evidence in China, thereby clarifying and tracing copyright ownership even for resources involving multiple rights holders. Value-driven management is realized through a dynamic tiered storage model that categorizes resources into hot, warm, and cold tiers according to multidimensional metrics such as archival value, access frequency, format risk, and content uniqueness. High-value resources are stored on high-performance media with prioritized access, whereas lower-value materials are transferred to more cost-effective solutions such as tape or optical storage. This approach not only reduces operational costs and environmental impact but also enhances resource utilization efficiency, supporting the green transformation goals emphasized in national strategy. By integrating these technological innovations, the platform offers a sustainable solution for the long-term preservation of digital publications. It facilitates reliable, tamper-evident, and cost-efficient storage while tackling fundamental issues such as technological discontinuity, rights fragmentation, and value neglect. Future efforts will concentrate on improving interoperability, refining metadata standards, and establishing collaborative mechanisms to ensure the platform’s continued adaptability and sustainability in preserving digital cultural heritage for generations to come.