Background:　With　the　development　of　network　technology　and　the　continuous　increase　in　user-generated　content　on　the　Internet,　the　protection　of　digital　copyright　is　particularly　important.　Objective:　In　order　to　better　protect　the　copyright　of　digital　works,　this　paper　proposes　a　Polkadot　scheme　based　on　the　advantages　of　blockchain　cross-chain　technology.　Methods:　The　scheme　sets　up　three　parallel　chains,　including　digital　work　chain,　copyright　management　chain,　and　dispute　arbitration　chain,　and　shows　the　information　interaction　process　of　Validators,　Fishermen,　Collators,　and　Nominators.　Results:　The　research　shows　that　the　scheme　has　more　advantages　than　a　single　chain　or　alliance　chain.　It　has　a　shorter　block　creation　time,　better　security,　and　availability.　Conclusion:　The　findings　provide　new　ideas　for　copyright　registration,　copyright　trading,　and　infringement　maintenance　of　digital　works　and　also　broadens　the　application　of　cross-chain　technology　of　blockchain.　©　2022　Bentham　Science　Publishers.