This document discusses integrating Corda applications with external systems through HTTP/REST APIs. It introduces Cordit, an open-source project that aims to automatically generate REST APIs from Corda code to allow Cordapps to be invoked via HTTP. Cordit uses techniques like bytecode manipulation and Swagger integration to provide fully typed, high-performance REST bindings to the Corda RPC API and capabilities like starting flows, querying vaults, and tracking progress. The project plans to contribute code to the Corda GitHub and add additional features over the next year.

11. Writing & Integrating a Cordapp
(summary)
Write Cordapp
Write webservice
Integrate with Systems
Fame and Fortune

12. Write / Update
cordapp
Read articles on
Spring + Corda
Write / Update the
Webservice
Write more tests
Discover functional
/ performance /
security issues
Debug, Debug,
Debug
Reality

13. The Evidence

14. Where this impacts
1. Large companies & enterprises that only
allow HTTP/S service calls
2. Startups & SMBs who need to build and
iterate on prototypes quickly

15. R3 & Community Responses
braid

16. What If …
Write Cordapp
Integrate with Systems
Fame and Fortune

17. Like this …
CordaRPC
Corda Node
Auto Code-Gen
REST/HTTP/S
OAC Server
Auto Discovery
Application

18. Demo

19. How Does It Work?
Async
Webserver
For high
Performance
throughput
Bytecode
Type-
Crafting
For fast payload
deserialisation
Type
Hierarchy
Modeler &
Serialisers
For zero-
annotation
integration
VertX ASM
Swagger2 /
Jackson
Corda RPC Binding

20. Plan
 Full type-safe model hierarchy
 Corda API integration
 Cordapp Flow Invocation
 Vault Queries
 Cross over to Corda Github - 19Q4
 Gradle integration - 19Q4
 Webhooks and chunked response Progress Trackers -
 Webhooks and chunked response Vault track-by - 20Q
 OpenRPC – streaming JSON-RPC capability - 20Q2

21. The gift that keeps on giving"
Todd McDonald @ R3
Cordit
e
Cordite is a trusted
independent open source
project and proving
ground for disruptive
usually controversial
features that broaden
Corda’s appeal across the
blockchain eco-system.
Cross-platform
integration
Issuance Transfers
Accounts
Fast
Meta-data
Reporting
Digital
Mutuals
Invoicing
Transaction
Metering
Network Map
Private Nets
Kubernetes
Docker

23. Thank you!
Any questions?
https://github.com/corda/openapi-sample
https://gitlab.com/bluebank/braid
@dazraf
fp@lab577.io