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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.
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The node now sends a transaction to the verifier if any of its attachments were compiled with Kotlin 1.2 (the net.corda.node.verification.external system property has been removed). It uses kotlinx-metadata to read the Kotlin metadata in the attachment to determine this. For now this scanning is done each time the attachment is loaded from the database. The existing external verification integration tests were converted into smoke tests so that 4.11 nodes could be involved. This required various improvements to NodeProcess.Factory. A new JAVA_8_HOME environment variable, pointing to JDK 8, is required to run these tests. There is still some follow-up work that needs to be done: Sending transactions from a 4.11 node to a 4.12 node works, but not the other way round. A new WireTransaction component group needs to be introduced for storing 4.12 attachments so that they can be safely ignored by 4.11 nodes, and the 4.12 node needs to be able to load both 4.11 and 4.12 versions of the same contracts CorDapp so that they can be both attached to the transaction. Even though attachments are cached when retrieved from the database, the Kotlin metadata version should be stored in the attachments db table, rather than being scanned each time. Finally, VerificationService was refactored into NodeVerificationSupport and can be passed into SignedTransaction.verifyInternal, instead of needing the much heavier VerifyingServiceHub. This makes it easier for internal tools to verify transactions and spawn the verifier if necessary. |
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| build.gradle | ||
| BUILD.md | ||
| buildCacheSettings.gradle | ||
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| gradlew.bat | ||
| Jenkinsfile | ||
| LICENSE | ||
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| SECURITY.md | ||
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| TRADEMARK | ||
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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