Corda Oracle Example
Currently based upon v1.0.
This CorDapp implements an oracle service that allows nodes to:
- Request the Nth prime number
- Request the oracle's signature to prove that the number included in their transaction is actually the Nth prime number
Whilst the functionality is superfluous (as primes can be verified deterministically via the contract code), this CorDapp is a simple example of how to structure an oracle service that provides querying and signing abilities. In the real world, oracles would instead provide and sign statements about stock prices, exchange rates, and other data.
This repo is split into three CorDapps:
- A base CorDapp which includes the state and contract definition, as well as some utility flows that need to be shared by both the Oracle service and the client
- A client CorDapp which implements a flow to create numbers involving oracle-validated prime numbers
- A service which implements the primes oracle
Running the CorDapp
The CorDapp is run by following the instructions here: https://docs.corda.net/tutorial-cordapp.html#running-the-example-cordapp.
Once the nodes are running, you can request a prime via the browser using:
http://localhost:10007/api/primes/create-prime?n=X
Where X is the index of the prime number you want to request.