Blacklist CorDapp

This CorDapp shows the end-to-end process of upgrading contracts in Corda.

The upgrade takes place in four stages:

Create a replacement contract implementing the UpgradedContract interface
Bundle the replacement contract into a CorDapp and install it on each node
For each state you wish to upgrade the contract of, authorise the contract upgrade for that state on each node
On a single node, authorise the contract upgrade for each state you wish to upgrade the contract of

In this case, we are only upgrading the contract. It is also possible to upgrade the state only, or both the state and the contract at once.

Pre-requisites:

See https://docs.corda.net/getting-set-up.html.

Usage

Running the nodes:

See https://docs.corda.net/tutorial-cordapp.html#running-the-example-cordapp.

Upgrading the contract:

Run the following command from the project's root folder:

Unix/Mac OSX: ./gradlew runUpgradeContractClient
Windows: gradlew runUpgradeContractClient

This will run the contract upgrade client defined here: https://github.com/joeldudleyr3/contract-upgrades/blob/master/cordapp/src/main/kotlin/com/upgrade/Client.kt. This client will:

Connect to PartyA and PartyB's nodes via RPC
Issue a state with the old contract
Upgrade the state to use the new contract
Wait ten seconds for the contract upgrade to propagate
Log the state to show that its contract has been upgraded

You should see a message of the form:

```I 17:41:35 1 UpgradeContractClient.main - TransactionState(data=State(a=C=GB,L=London,O=PartyA, b=C=US,L=New 
York,O=PartyB), contract=com.upgrade.NewContract, notary=C=GB,L=London,O=Controller,CN=corda.notary.validating, 
encumbrance=null, constraint=HashAttachmentConstraint(attachmentId=670BD1385F920D5F87FA9F42FAA2DE86E31F1CAD...))```

To-Do