In the integrated circuit (IC) industry, due to the inadequate protection mechanisms for IP cores, the design achievements of engineers are difficult to effectively safeguard, leading to a large number of excellent IP cores unable to legally circulate among designers. To alleviate these troubles, we propose a blockchain-based trade method. First, we design unique chain structures for storing and verifying IP core ownership and transaction contracts to reduce the misuse of intellectual property circuits. Then, we also design smart contract algorithms to automates the generation and verification process of digital identities and contract subscriptions. Additionally, we propose a dual-signature strategy to ensure the non-repudiation of contract signatures. Finally, we implement a prototype system and conduct security analysis. Experimental results demonstrate that the model can effectively resist several attacks and has good performance.