[论文解读] Decentralized Identity in Practice: Benchmarking Latency, Cost, and Privacy
该论文在统一设置下对三种基于分类账的去中心化标识符(DID)方法(Ethereum、Hedera、XRPL)进行基准测试,通过元数据泄漏分数(MLS)评估延迟、成本和隐私。
Decentralized Identifiers (DIDs) are increasingly deployed on distributed ledgers, yet systematic cross-platform evidence on their operational behavior remains limited. We present an empirical benchmarking study of three prominent ledger-based DID methods - Ethereum, Hedera, and XRP Ledger - using reference Software Development Kits (SDKs) under a unified experimental setup. We measure latency, transaction cost, and on-chain metadata exposure, normalizing latency by each platform's block or consensus interval and cost by its native value transfer fee. Privacy leakage is quantified using a Metadata-Leakage Score (MLS), an entropy-based measure expressed in bits per operation. Our results reveal distinct architectural trade-offs. Ethereum enables near-instant, off-chain DID creation, but incurs the highest latency and cost for on-chain lifecycle operations. XRPL delivers deterministic and stable latency with fixed, low fees, yet exhibits higher metadata leakage due to more verbose transaction payloads. Hedera achieves the lowest on-chain latency and low fees with minimal metadata leakage, while occasional variance arises from SDK-side processing and confirmation pipelines. Overall, the findings show that ledger architecture and SDK workflows play a major role in shaping DID latency, cost, and metadata exposure, complementing the effects of the underlying consensus mechanism. These results provide evidence-based insights to support informed selection and configuration of DID systems under performance and privacy constraints.
研究动机与目标
- 推动在跨平台上获得对运营性 DID 行为的证据的必要性。
- 在基于区块链的 DID 上基准测试延迟、交易成本和链上元数据暴露。
- 对测量进行标准化,以适应平台特有的区间和费用。
- 使用基于熵的 MLS 指标量化隐私泄漏。
- 在性能与隐私约束下,为选择与配置 DID 系统提供指导。
提出的方法
- 使用参考 SDK 在以太坊、Hedera 和 XRPL 上以统一的实验设置实现 DID 操作。
- 测量延迟,按各平台的区块或共识间隔进行归一化。
- 测量成本,按本地原生价值转移费进行归一化。
- 使用基于每次操作熵的元数据泄漏分数(MLS)量化链上元数据暴露程度。
- 分析区块链架构与 SDK 工作流如何影响延迟、成本与隐私。
实验结果
研究问题
- RQ1在统一工作流下,延迟、成本和隐私在以太坊、Hedera 和 XRPL 的 DID 操作中如何比较?
- RQ2近瞬时的链下 DID 创建与链上生命周期成本(以太坊)与确定性延迟和低费用(XRPL)以及低 MLS(Hedera)之间存在哪些权衡?
- RQ3SDK 处理与确认流水线如何影响观测到的性能与元数据泄露?
- RQ4在共识机制之外,区块链架构与 SDK 工作流在多大程度上影响隐私暴露?
主要发现
- 以太坊可实现近即时的链下 DID 创建,但其链上生命周期操作的延迟和成本较高。
- XRPL 提供确定性、稳定的延迟,且费用固定、较低,但由于较冗长的交易负载导致元数据泄露较高。
- Hedera 实现最低的链上延迟与低费用,同时元数据泄露最小,偶尔受 SDK 处理影响而有波动。
- 区块链架构与 SDK 工作流在超越共识机制的方面显著影响延迟、成本和元数据暴露。
- 研究结果为在特定性能与隐私约束下对 DID 系统的明智选择与配置提供支持。
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