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There was a mistake made when we first introduced notary request signature checking, in that we didn't wrap it in SerializedBytes so it always got deserialized as part of the flow message payload. So to check the signature, it has to be re-serialized. This means for cross-version compatibility we can never change the serialized format of NotarisationRequest. In this case we need make sure that every SecureHash mentioned in that data structure is a distinct instance, even if the values are repeated / identical, as that is how it was in Corda 1. With the introduction of interning of SecureHash, this ceased to be true once again, including undoing the attempts to force it on the sending side that had been introduced in previous versions of Corda. So here we introduce a way to force it, and consolidate the forcing to distinct SecureHash instances in the NotarisationRequest itself, rather than leaving to the caller of the constructor to remember to do it, so that serialized form will always be as per Corda 1.
Corda
Corda is an open source blockchain project, designed for business from the start. Only Corda allows you to build interoperable blockchain networks that transact in strict privacy. Corda's smart contract technology allows businesses to transact directly, with value.
Architecture Evolution
The code present in this repository reflects the first version of the implementation of the Corda model for DLT technology. This first architecture version covers Corda versions 1 through 4 and continues to deliver on the promise of DLT for both the open source community and industry as a whole.
However, like all things, Corda must evolve to serve the more stringent needs of today. This is why the second (and current) version of the Corda Architecture can be found here and will form the basis of the Corda 5 release.
Features
- Smart contracts that can be written in Java and other JVM languages
- Flow framework to manage communication and negotiation between participants
- Peer-to-peer network of nodes
- "Notary" infrastructure to validate uniqueness and sequencing of transactions without global broadcast
- Enables the development and deployment of distributed apps called CorDapps
- Written in Kotlin, targeting the JVM
Getting started
- Read the Getting Started documentation
- Run the Example CorDapp
- Read about Corda's Key Concepts
- Follow the Hello, World! tutorial
Useful links
- Project Website
- Mailing List
- Documentation
- Stack Overflow Tag
- Slack Channel
- Meetups
- Training Courses
Contributing
Corda is an open-source project and contributions are welcome!
To find out how to contribute, please see our contributing docs.
License
Acknowledgements
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