Non-fungible tokens (NFTs) on Ethereum currently follow a binary mobility paradigm: ERC-721 enables unrestricted transfers, whereas SBTs (ERC-5192) prohibit transfers entirely. We identify a design gap in which no standard mechanism supports bounded transferability, where ownership mobility is allowed but limited to a finite number of programmable transfers. We study counted NFT transfers and introduce ERC-7634 as a minimal realization compatible with ERC-721. The design augments each token with a transfer counter and configurable cap L, allowing ownership to evolve under a finite transfer budget. ERC-7634 defines a minimal extension interface with three lightweight functions (transferCountOf, setTransferLimit, and transferLimitOf), two events, and native-transfer hooks, requiring fewer than 60 additional lines of Solidity while preserving full backward compatibility with existing NFT infrastructure. We analyze behavioral and economic consequences of counted transfers. Our results reveal (i) a mobility premium induced by remaining transfer capacity, (ii) a protocol-level costing signal that can deter wash trading in cap-aware markets through irreversible budget consumption, (iii) bounded recursive collateralization enabled by limited ownership turnover, and (iv) associated security and gas-cost implications, including wrapper-bypass trade-offs. Evaluation on calibrated simulations shows that moderate limits (e.g., L = 10) affect fewer than 15% of tokens under representative transfer distributions, while repeated manipulation becomes unprofitable after a few cycles in a cap-aware pricing model; the additional gas overhead remains below 11% per transfer. We further position ERC-7634 within the NFT mobility design space, derive practical cap-selection guidelines, and discuss post-cap ownership outcomes including soulbound conversion, auto-burn, and provenance freeze.

翻译：以太坊上的非同质化代币（NFT）目前遵循二元流动性范式：ERC-721支持无限制转移，而灵魂绑定代币（SBT，ERC-5192）则完全禁止转移。我们识别出一个设计空白：当前缺乏支持有限可转移性的标准机制，即允许所有权流动但将其限制在可编程的有限转移次数内。本研究探讨可计数NFT转移，并提出ERC-7634作为与ERC-721兼容的最小化实现方案。该设计为每个代币增设转移计数器与可配置上限L，使所有权能在有限转移预算下进行演化。ERC-7634定义了最小化扩展接口，包含三个轻量级函数（transferCountOf、setTransferLimit与transferLimitOf）、两个事件及原生转移钩子，仅需不足60行Solidity代码即可实现，同时保持与现有NFT基础设施的完全向后兼容性。我们分析了可计数转移的行为学与经济学效应，研究结果表明：（1）剩余转移能力会引发流动性溢价；（2）协议层级的成本信号可通过不可逆的预算消耗，在具备上限感知能力的市场中抑制刷单交易；（3）有限的所有权更替支持有界递归抵押；（4）存在相应的安全性与燃气成本影响，包括封装器规避的权衡问题。校准仿真评估显示：在典型转移分布下，适度限制（如L=10）仅影响不足15%的代币；而在上限感知定价模型中，重复操纵行为在数次循环后即无利可图；单次转移的额外燃气开销始终低于11%。我们进一步将ERC-7634置于NFT流动性设计空间中进行定位，推导出实际上限选择准则，并探讨上限耗尽后的所有权处置方案，包括灵魂绑定转换、自动销毁与溯源冻结。