<p>Achieving seamless interoperability between heterogeneous metaverse platforms for real-time, reliable interactions remains a critical challenge. Existing cross-chain solutions often fail to simultaneously guarantee low latency, reliable delivery, and secure consensus, thereby limiting user experience and asset liquidity. This paper proposes the Relay-Integrated Hash Locking Protocol (RIHLP), a blockchain-based cross-chain solution that addresses these limitations. RIHLP integrates relay nodes with hash-locking mechanisms: relays monitor hash-locked transactions on the source chain and forward synchronization signals for cross-chain locking and unlocking operations, eliminating the triggering delays caused by on-chain polling and prolonged confirmations in traditional systems. Operating under an Asynchronous Byzantine Fault Tolerance (ABFT) model, RIHLP employs a multi-value consensus mechanism with threshold decryption. Asynchronous reliable broadcasting ensures that transaction proposals reach all honest nodes uniformly, while threshold decryption conceals transaction details until consensus is reached, achieving consistent proposal propagation and data confidentiality without synchronous assumptions. Additionally, a dynamic fee adjustment mechanism within smart contracts automatically adapts transaction fees based on network load and observable timeout or blocking behaviors. Experimental results demonstrate that RIHLP reduces transaction completion times compared to existing solutions including Hashed Timelock Contracts (HTLC), while maintaining comparable security levels and meeting metaverse interoperability requirements.</p>