As 6G networks evolve, spectrum assets require flexible, dynamic, and efficient utilization, motivating blockchain based spectrum securitization. Existing approaches based on ERC404 style hybrid token models rely on frequent minting and burning during asset transfers, which disrupt token identity continuity and increase on chain overhead. This paper proposes the Semi Fungible Token Lock (SFT Lock) method, a lock/unlock based mechanism that preserves NFT identity and historical traceability while enabling fractional ownership and transferability. By replacing mint/burn operations with deterministic state transitions, SFT Lock ensures consistent lifecycle representation of spectrum assets and significantly reduces on chain operations. Based on this mechanism, a modular smart contract architecture is designed to support spectrum authorization, securitization, and sharing, and a staking mechanism is introduced to enhance asset liquidity. Experimental results on a private Ethereum network demonstrate that, compared with ERC404 style hybrid token models, the proposed method achieves substantial gas savings while maintaining functional correctness and traceability.

翻译：随着6G网络的发展，频谱资产需要灵活、动态和高效的利用方式，这推动了基于区块链的频谱证券化研究。现有基于ERC404风格混合代币模型的方法在资产转移过程中依赖频繁的铸造与销毁操作，这会破坏代币身份连续性并增加链上开销。本文提出半同质化代币锁（SFT-Lock）方法，这是一种基于锁定/解锁的机制，在保持非同质化代币身份与历史可追溯性的同时，支持份额化所有权与可转让性。通过用确定性状态转换替代铸造/销毁操作，SFT-Lock确保了频谱资产生命周期表征的一致性，并显著减少了链上操作。基于此机制，本文设计了模块化智能合约架构以支持频谱授权、证券化与共享，并引入质押机制以增强资产流动性。在私有以太坊网络上的实验结果表明，相较于ERC404风格的混合代币模型，所提方法在保持功能正确性与可追溯性的同时，实现了显著的燃气成本节约。