Asset Exchange: Corda with Besu

We will demonstrate asset exchange of an AliceERC721 NFT in Besu network1 with 10 tokens on Corda_Network. For Besu commands, run from samples/besu/besu-cli folder, and for Corda commands, run from samples/corda/corda-simple-application folder. Here Alice with account 1 and Bob with account 2 in Besu network1 correspond to PartyA (CORDA_PORT=10006) and PartyB (CORDA_PORT=10009) in Corda_Network respectively. Following are the step-by-step asset exchange process:

From corda client, generate secret-hash pair using following command (prints hash in base64):
```
./clients/build/install/clients/bin/clients utils hash --hash-fn=SHA256 -s secrettext
```
Run the following to verify the status of the tokens owned by PartyA and PartyB in the Corda_Network and Corda_Network2:
```
./scripts/getAssetStatus.sh 2
```

Run the following in besu-cli, to verify the status of the assets owned by Alice and Bob in the Besu networks:

./bin/besu-cli asset get-balance --network=network1 --account=1
./bin/besu-cli asset get-balance --network=network1 --account=2

Complete the asset exchange using following steps:

Run the following to trigger alice locking AliceERC721 token with id 0 for bob in network1 for 1 hour

./bin/besu-cli asset lock --network=network1 --sender_account=1 --recipient_account=2 --token_id=0 --asset_type=ERC721 --timeout=3600 --hash_base64=ivHErp1x4bJDKuRo6L5bApO/DdoyD/dG0mAZrzLZEIs=

Note the contract-id printed as output in above command. The output line containing contract-id (text in base64 after Lock contract ID:) would like this:

Lock contract ID: 48f59da2ac632117bf79b4aa986f5ece8a2439dc143d576965c17bc8275b0925

Run the following to verify alice's lock, replacing <contract-id> with actual contract-id:
```
./bin/besu-cli asset is-locked --network=network1 --lock_contract_id=<contract-id>
```
Run the following to trigger PartyB locking 50 units of token type t1 for PartyA in Corda_Network for 30 mins:
```
CORDA_PORT=10009 ./clients/build/install/clients/bin/clients lock-asset --fungible --hashBase64=ivHErp1x4bJDKuRo6L5bApO/DdoyD/dG0mAZrzLZEIs= --timeout=1800 --recipient="O=PartyA,L=London,C=GB" --param=t1:50
```
Note the contract-id displayed after successful execution of the command, will be used in next steps. The output containing contract-id would like this:
```
HTLC Lock State created with contract ID Right(b=10448674_80d2bee7-5a5d-45df-b14e-60bac4ba1bf3).
```
contract-id is the alphanumeric text (with underscore and hyphens) after b= within parenthesis. Let's refer it <contract-id-2> for this demonstration.

Run the following to verify PartyB's lock (can be verified by both parties):

CORDA_PORT=10006 ./clients/build/install/clients/bin/clients is-asset-locked --contract-id=<contract-id-2>

Run the following to trigger PartyA's claim for 50 units of token type t1 locked by PartyB in Corda_Network:
```
CORDA_PORT=10006 ./clients/build/install/clients/bin/clients claim-asset --secret=secrettext --contract-id=<contract-id-2>
```
PartyB can see its node's logs to get the revealed hash preimage, and use it to claim in the Besu network.
Run the following to trigger bob's claim for AliceERC721 NFT with id 0 locked by alice in network1:
```
./bin/besu-cli asset claim --network=network1 --recipient_account=2 --preimage=secrettext --token_id=0 --lock_contract_id=<contract-id>
```
The above steps complete a successful asset exchange between two Besu networks. In addition to the above commands, following commands can be run if specified timeout has expired and the locked asset remains unclaimed.
If alice wants to unlock the asset, run the following to trigger alice's re-claim for AliceERC721 NFT with id 0 locked in network1:
```
./bin/besu-cli asset unlock --network=network1 --lock_contract_id=<contract-id> --sender_account=1 --token_id=0
```
If PartyB wants to unlock the token asset, run the following to trigger unlock for t1:50 locked in Corda_Network:
```
CORDA_PORT=10009 ./clients/build/install/clients/bin/clients unlock-asset --contract-id=<contract-id>
```

Run the following to verify the status of the tokens owned by PartyA and PartyB in the Corda_Network and Corda_Network2:
```
./scripts/getAssetStatus.sh 2
```

Run the following in besu-cli, to verify the status of the assets owned by Alice and Bob in the Besu networks:

./bin/besu-cli asset get-balance --network=network1 --account=1
./bin/besu-cli asset get-balance --network=network1 --account=2