With the widespread dissemination of online videos, copyright disputes are becoming increasingly severe. To address the key challenges of weak watermark robustness and low credibility of evidence storage in digital video copyright protection, this study proposes a video copyright protection mechanism integrating dual-channel watermarking and blockchain-based copyright protection system (DCW-BCPS). In this mechanism, copyright identifiers are synchronously embedded into video and audio streams through a QR-driven dual-stream watermarking mechanism (QDSWM) scheme. The collaborative design across dual domains preserves subjective video quality while ensuring the immutability of copyright information through blockchain-based evidence storage, thereby enabling comprehensive video copyright protection and multi-level video copyright dispute resolution. The system supports originality verification, dual-channel joint verification, and hierarchical dispute handling. Experimental results demonstrate that the proposed watermark exhibits strong robustness against attacks such as cropping, frame swapping, and audio filtering, with high normalized correlation (NC) values maintained during watermark extraction, reaching 0.9902 under frame swapping attacks and 0.6414 under 10% cropping attack. Additionally, the blockchain-based evidence storage achieves a throughput of 1125 TPS, and the single-frame embedding time is reduced to 12 ms under GPU acceleration, satisfying the industrial deployment requirements of high-concurrency real-time processing scenarios. The proposed mechanism provides effective technical support for video copyright verification and infringement traceability.