Toward Achieving Anonymous NFT Trading

Toward Achieving Anonymous NFT Trading
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实现匿名 NFT 交易

DOI:
10.1109/access.2022.3228787
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发表时间:
2022
期刊:
影响因子:
3.9
通讯作者:
Omote Kazumasa
Omote Kazumasa
中科院分区:
计算机科学3区
文献类型:
--
作者:
Chen Zhanwen;Omote Kazumasa

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近年来,随着不可替代代币(NFT)市场的快速发展,各种类型的数字艺术品通过NFT发布以进行销售。在当前的NFT系统中,每个NFT的所有者地址以明文存储。这导致了严重的隐私问题:一旦一个人的区块链地址被知道,他所有的NFT资产都是可见的,这可能进一步导致与持有敏感NFT的隐私相关的问题,或者对高价值NFT所有者进行有预谋的诈骗。然而,由于以太坊和智能合约的限制,很难防止其他人跟踪NFT的所有者。与此同时,目前最先进的NFT研究通常假设区块链地址和所有者身份之间的关系是未知的,从而创造了所谓的匿名性。在本文中,基于最流行的NFT市场OpenSea的系统,我们提出了一个新的交换方案,隐藏在交易过程中的NFT所有者的地址。为了实现我们的目标,利用承诺证明方案将所有者绑定到NFT,同时隐藏身份。此外,设计了一种匿名支付方法,以防止攻击者跟踪NFT交易中的以太流。我们的计划被证明是安全的好奇的用户和恶意的主动攻击者。在测试网络上的实现也表明,增加的气体成本是可以接受的,这意味着它是适合应用的。
With the rapid development of Non-Fungible Token (NFT) market, various types of digital artwork are published via NFT in recent years for sale. In the current NFT system, owner’s address of each NFT is stored in plaintext. This leads to a severe privacy problem: once a person’s blockchain address is known, all his NFT assets are viewable, which may further cause problems related to the privacy of holding sensitive NFT or premeditated scams to high-value NFT owners. However, due to the limitation of Ethereum and smart contract, it is hard to prevent others from tracking the owner of NFT. Meanwhile, current state-of-the-art NFT research usually assumes the relation between blockchain address and owner’s identity is unknown, thus creating the so-called anonymity. In this paper, based on the most popular NFT marketplace OpenSea’s system, we propose a new exchange scheme to hides the address of NFT owner during trading. To achieve our goal, a proof of commitment scheme is exploited to bind the owner to an NFT while hiding the identity. Moreover, An anonymous payment method is designed to prevent attackers from tracing the Ether flow in NFT trading. Our scheme is proven to be secure against curious users and malicious active attackers. Implementation on testnet also shows that the increased gas cost is acceptable, meaning it is suitable for application.
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