<p>Sealed electronic auctions aim to protect the bidding privacy of participants, with blockchain technology typically employed to achieve decentralized management, ensuring fairness and transparency. However, blockchain relies on public key infrastructure, which incurs high maintenance costs. To address this issue, we design a sealed electronic auction scheme based on a consortium blockchain, leveraging attribute-based hybrid encryption. This scheme uses the consortium blockchain to store core auction data, employing ciphertext-policy attribute-based encryption combined with symmetric encryption to significantly reduce reliance on public key infrastructure. Additionally, it adopts hidden access policies and user attributes to safeguard user privacy. The auction process embeds each user’s unique identity into attributes to resist collusion attacks. Moreover, multi-party storage technology is employed to optimize data storage efficiency and reduce consortium blockchain maintenance costs. In terms of security, rigorous mathematical proofs and multiple security mechanisms ensure resistance against chosen-plaintext attacks, collusion attacks, and data integrity threats. Experimental results demonstrate that the proposed scheme reduces the overall time for on-chain operations and the entire auction process by approximately 2.7–7.4 times compared to traditional schemes. Furthermore, the hybrid encryption strategy enhances the computational efficiency of encryption and decryption processes, achieving an excellent balance between security and efficiency.</p>