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https://github.com/hyperledger-labs/private-data-objects

The Private Data Objects lab provides technology for confidentiality-preserving, off-chain smart contracts.
https://github.com/hyperledger-labs/private-data-objects

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The Private Data Objects lab provides technology for confidentiality-preserving, off-chain smart contracts.

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README 

        

Hyperledger Private Data Objects

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Private Data Objects (PDO) enables sharing of data and coordinating action

amongst mutually distrusting parties. Interaction is mediated through a “smart

contract” that defines data access and update policies that are carried with

the object regardless of where it resides or how often it changes hands. The

smart contracts policies are enforced through execution in a Trusted Execution

Environment (TEE).



PDO uses a distributed ledger, in this case the

[Microsoft Confidential Consortium Framework (CCF)](https://microsoft.github.io/CCF/)

distributed ledger, to ensure that there is a single, authoritative

instance of the object, and to provide a means of guaranteeing atomicity of

updates across interacting objects. PDO performs contract execution and storage off the blockchain, with only a hash of

blockchain state stored on the distributed ledger.

Currently, the PDO/CCF combo is restricted to simulated enclaves.



PDO provides benefits for both application developers seeking to define and

implement privacy-preserving distributed ledgers, and for service providers

seeking to provide blockchain services.



For the application developer, smart contracts implemented with PDO ensure that

contract state is completely hidden from all participants, including contract

validators, and allows contracts to be stored off-chain. Policies and data are

bound up together in the PDO smart contract; polices travel with the data no

matter how the smart contract object is shared or with whom. The PDO smart

contact provides an enforceable agreement for multi-party data sharing and

analytics.



For service providers, PDO provides scalable performance; separation of

contract execution from ordering allows the performance of contract execution

to scale with available hardware. Because PDO contract execution occurs off

the blockchain, redundancy is limited to the applications requirements rather

than the entire blockchain, providing fewer potential targets for compromise.



Please see the [PDO Contracts](https://github.com/hyperledger-labs/pdo-contracts) open-source repository for sample smart contracts developed using the Private Data Objects framework. Our examples cover  smart contracts for  managing fungible and non-fungible assets, contracts that can be used to set up a fair exchange of assets among multiple parties, etc. Please use these sample contracts as guide to develop your own PDO smart contracts. We encourage you to share your use-cases including solution approaches to the [PDO Contracts](https://github.com/hyperledger-labs/pdo-contracts) repository.



Documentation

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Instructions for installing/building Hyperledger Private Data Objects can be

found in the [build documentation](docs/install.md).



The [usage document](docs/usage.md) describes what you can do with a functional PDO

installation.



For more information about how Private Data Objects work, see the

[specification document](docs/specification.md).



A paper with a more formal overview of Private Data Objects is available

[HERE](https://arxiv.org/abs/1807.05686).



A presentation about Private Data Objects is available

[HERE](https://docs.google.com/presentation/d/16V0kK9M_z86WwI-PfdltY5plXnkOdFuK84sWFaExH_k).



Project Status

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Hyperledger Private Data Objects operates as a Hyperledger Labs project. This

code is provided solely to demonstrate basic PDO mechanisms and to facilitate

collaboration to refine PDO architecture and define minimum viable product

requirements. The code provided in this repository is prototype code and not

intended for production use.



Sponsor

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Dan Middleton ([email protected])



License

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Hyperledger Private Data Objects software is released under the Apache License

Version 2.0 software license. See the [license file](LICENSE) for more details.



Hyperledger Private Data Objects documentation is licensed under the Creative

Commons Attribution 4.0 International License. You may obtain a copy of the

license at: http://creativecommons.org/licenses/by/4.0/.