# Burn and Mint Tokens using Zwallet

[ZCN smart contract](https://github.com/0chain/0chain/tree/staging/code/go/0chain.net/smartcontract/zcnsc) allows conversion of native ZCN token network to Ethereum wrapped WZCN token and from wrapped Ethereum WZCN token to native ZCN token through minting and burning of tokens using zwalletcli.\\

## Get Started

### Import your Ethereum Account

`./zwallet bridge-import-account` command can be used to import your ethereum account Here are the parameters for the command.

| Parameter  | Required | Description                     |
| ---------- | -------- | ------------------------------- |
| --mnemonic | Yes      | Ethereum Wallet Mnemonic Phrase |
| --password | Yes      | Ethereum Wallet Password        |

Sample Command:

```
./zwallet bridge-import-account --mnemonic "$MNEMONIC_PHRASE" --password "$ETHEREUM_WALLET_PASSWORD"
```

Sample Response:

```
Imported account $ETHEREUM_WALLET_ADDRESS 
to path: $WALLET_CONFIG_DIRECTORY
```

### Prerequisites

In order to perform DEX operations using zwalletcli basic config.yaml 0chain configuration file should be extended with the following params

```
---
block_worker: https://demo.zus.network/dns
signature_scheme: bls0chain
min_submit: 50 # in percentage
min_confirmation: 50 # in percentage
confirmation_chain_length: 3
ethereum_node_url: https://goerli.infura.io/v3/6141be73a15d47748af0dc14f53d57d7
store_unlock_duration_sec: 2

bridge:
  bridge_address: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  token_address: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  authorizers_address: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  ethereum_address: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  password: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
```

### Burn ZCN and Mint WZCN token

1. Navigate into zwalletCLI directory

```
cd zwallet
```

2\. Run the command below to list or check whether your ethereum account is imported successfully in key vault.

```
./zwallet bridge-list-accounts
```

Sample Response:

```
Ethereum available account: $ETHEREUM_WALLET_ID
```

3\. Create ZCN wallet and fill it with tokens using the `./zwallet faucet` command.

<pre><code><strong>./zwallet faucet --methodName pour --input “{Pay day}”
</strong></code></pre>

Sample Response:

```
Execute faucet smart contract success with txn :  04f9a181c87a77306d4a6aa6473385eecacfa04c12933d96f1fae74e0c017949
```

4\. Now to burn some ZCN tokens use the following command:

```
./zwallet bridge-burn-zcn --token 1 
```

Sample Response:

```
Executed smart contract successfully with txn:  $ZCN_BURN_HASH
Transaction completed successfully:
```

The response will output an zcn-burn-hash like above which can be used to fetch details about the burn transaction and mint WZCN tokens.

5\. Here is a command for checking details about the ZCN burn transaction:

<pre><code><strong>./zwallet bridge-get-zcn-burn --hash $ZCN_BURN_HASH
</strong></code></pre>

Sample Response:

```
ZCN burn ticket the completed consensus
Transaction nonce: 2
Transaction amount: 10000000000
ZCN transaction ID: $ZCN
```

6\. Mint WZCN tokens using the command below:

```
./zwallet bridge-mint-wzcn --hash "zcn-burn-hash" 
```

Sample Response:

```
Sending mint transaction to Ethereum
Payload amount: 10000000000
Payload nonce: 2
ZCN transaction ID: 67b7e0ea1d6522b62e93b22aef140dc59d2a61c6b4469a3c8f8cb8ae09b32eaa
Starting to mint WZCN
failed to prepare bridge: failed to pack arguments: argument count mismatch: got 4 for 5
```

### Burn WZCN and Mint ZCN

1. Run the command below to list or check whether your ethereum account is imported successfully in key vault. If not [import your Ethereum Account.](#import-your-ethereum-account)

   ```
   ./zwallet bridge-list-accounts
   ```

   Sample Response:

   ```
   Ethereum available account: $ETHEREUM_WALLET_ID
   ```
2. Fill your ethereum wallet with WZCN tokens can be done using [metamask](https://metamask.io/https://metamask.io/).
3. Burn WZCN tokens using the following command :

```
./zwallet bridge-burn-wzcn --amount 1  
```

### List Authorizers

`./zwallet bridge-list-auth` command can be used to list all authroizers available to validate client transactions.

**Sample Command:**

```
./zwallet bridge-list-auth
```

**Sample Response:**

```
[
  {
    "id": "2f945f7310689f17afd8c8cb291e1e3ba21677243aa1d404a2293064e7983d60",
    "url": "https://demo.zus.network/authorizer01/"
  },
  {
    "id": "7b07c0489e2f35d7c13160f4da2866b4aa69aa4e8d2b2cd9c4fc002693dca5d7",
    "url": "https://demo.zus.network/authorizer02/"
  },
  {
    "id": "896c171639937a647f9e91d5ba676be580f6d2b7e0d708e4fe6ea36610a13ffd",
    "url": "https://demo.zus.network/authorizer03/"
  }
]
```

### Show Authorizer Configuration

`./zwallet bridge-auth-config` command can be used to view authorizer configuration. Here are the parameters for the command.\\

| Parameter | Required | Description                                                                                                           |
| --------- | -------- | --------------------------------------------------------------------------------------------------------------------- |
| --id      | Yes      | Provide Authorizer ID to view its configuration . Can be fetched using[ list authorizers](#list-authorizers) command. |
| --help    |          | Syntax Help for the command                                                                                           |

Sample Command:

```
./zwallet bridge-auth-config --id $AUTHORIZER_ID
```

Sample Response:

```
{
  "id": "2f945f7310689f17afd8c8cb291e1e3ba21677243aa1d404a2293064e7983d60",
  "url": "https://demo.zus.network/authorizer01/",
  "fee": 0,
  "latitude": 0,
  "longitude": 0,
  "last_health_check": 0,
  "delegate_wallet": "",
  "min_stake": 0,
  "max_stake": 0,
  "num_delegates": 0,
  "service_charge": 0
}
```

### Show ZCNBridge Configurations

`./zwallet bridge-config` command can be used to view ZCNBridge configuration. To understand how to initialize a bridge client configurations check [Intialize a Bridge Client](#initialize-bridge-client).

Sample Command:

```
./zwallet bridge-config
```

Sample Response:

```
burn_address     0000000000000000000000000000000000000000000000000000000000000000
cost.add-authorizer      100
cost.burn        100
cost.delete-authorizer   100
cost.mint        100
max_delegates    10
max_fee          100
min_authorizers          1
min_burn         1
min_lock         0
min_mint         1
min_stake        0
owner_id         1746b06bb09f55ee01b33b5e2e055d6cc7a900cb57c0a3a5eaabb8a0e7745802
percent_authorizers      0.7

```


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