This objective of this report is to review existing enterprise blockchain technologies - EOSIO powered systems, Hyperledger Fabric and Besu, Consensus Quorum, R3 Corda and Ernst and Young's Nightfall - that provide data privacy while leveraging the data integrity benefits of blockchain. By reviewing and comparing how and how well these technologies achieve data privacy, a snapshot is captured of the industry's current best practices and data privacy models. Major enterprise technologies are contrasted in parallel to EOSIO to better understand how EOSIO can evolve to meet the trends seen in enterprise blockchain privacy. The following strategies and trends were generally observed in these technologies: Cryptography: the hashing algorithm was found to be the most used cryptographic primitive in enterprise or changeover privacy solutions. Coordination via on-chain contracts - a common strategy was to use a shared publicly ledger to coordinate data privacy groups and more generally managed identities and access control. Transaction and contract code sharing: there was a variety of different levels of privacy around the business logic (smart contract code) visibility. Some solutions only allowed authorised peers to view code while others made this accessible to everybody that was a member of the shared ledger. Data migrations for data privacy applications: significant challenges exist when using cryptographically stored data in terms of being able to run system upgrades. Multiple blockchain ledgers for data privacy: solutions attempted to create a new private blockchain for every private data relationship which was eventually abandoned in favour of one shared ledger with private data collections/transactions that were anchored to the ledger with a hash in order to improve scaling.

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区块链数据隐私解决方案技术回顾

本报告的目的是回顾现有的企业区块链技术-EOSIO支持的系统，Hyperledger Fabric和Besu，共识仲裁，R3 Corda以及Ernst and Young的Nightfall-这些技术可在利用区块链的数据完整性优势的同时提供数据隐私。通过回顾和比较这些技术如何以及如何更好地实现数据隐私，可以捕获行业当前最佳实践和数据隐私模型的快照。与EOSIO并行对比了主要的企业技术，以更好地了解EOSIO如何发展，以满足企业区块链隐私中的趋势。在这些技术中，通常观察到以下策略和趋势：密码术：发现散列算法是企业或转换隐私解决方案中使用最多的密码原语。通过链上合同进行协调-一种常见的策略是使用共享的公共分类帐来协调数据隐私组以及更一般地管理的身份和访问控制。交易和合同代码共享：围绕业务逻辑（智能合同代码）可见性存在各种不同级别的隐私。一些解决方案仅允许授权的对等方查看代码，而其他解决方案则使共享账本成员中的每个人都可以访问该代码。数据隐私应用程序的数据迁移：在使用加密存储的数据进行系统升级时，存在着巨大的挑战。多个区块链分类帐，用于数据隐私：