Pantos PANDAS Token Deploy - TESTNET

The following steps describe how deploy a PANDAS token in Pantos supported testnets. This step by step guide should guide you through the world of PANDAS and brownie.

Table of Contents

1. Setup all requirements and prerequisites
2. Add private key to brownie project
3. Adapt your token settings
4. Deploy preparations
5. Deploy your token
6. Register External Token
7. Unregister External Token
8. Unregister Token

1. Setup all requirements and prerequisites

• To be able to start with everything we need python installed. The version should be 3.6 or later
• brownie needs to be installed next. This is done by pip install eth-brownie - there are also other ways of installing it, just visit the docs.
• If the installation of python and brownie was successfully, we should now be able to run brownie in our command line and should see something like:

Brownie v1.19.3 - Python development framework for Ethereum

Usage:  brownie <command> [<args>...] [options <args>]

Commands:
  init               Initialize a new brownie project
  bake               Initialize from a brownie-mix template
  pm                 Install and manage external packages
  compile            Compile the contract source files
  console            Load the console
  test               Run test cases in the tests/ folder
  run                Run a script in the scripts/ folder
  accounts           Manage local accounts
  networks           Manage network settings
  gui                Load the GUI to view opcodes and test coverage
  analyze            Find security vulnerabilities using the MythX API

Options:
  --help -h          Display this message
  --version          Show version and exit

Type 'brownie <command> --help' for specific options and more information about
each command.

2. Add private key to brownie project

• If you already have a private key then use (where <id> is the identifier or name of your account):

brownie accounts new <id>

• If you do not have a private key then use (where <id> is the identifier or name of your account):

brownie accounts generate <id>

When a new account is generated the address is displayed to you, as well as the seed.

Do not forget to get enough funds to your newly created account. This can be done by using the faucet, by entering your account address.

3. Adapt MyToken.sol in /contracts folder

You just need to set a _NAME and a _SYMBOL you like your token to have.

...
contract MyToken is PantosBaseToken {
    string private constant _NAME = "MyToken"; /* replace with your token name */
    string private constant _SYMBOL = "MT"; /* replace with your token symbol */
    uint8 private constant _DECIMALS = 18; 
...

4. Adapt deploy_token.py in /scripts folder

If you want another inital amount than 100 just adapt the INITIAL_SUPPLY constant. Also FORWARDER_ADDRESS, HUB_ADDRESS and PAN_ADDRESS need to be copied from here, based on the testnet you want to deploy:

...
# Set initial token supply and minimum token stake
INITIAL_SUPPLY = 100 * 10 ** 18  # initial supply is 100 Token with 18 decimals
_MINIMUM_TOKEN_STAKE = 10 ** 3 * 10 ** 8

# Set the addresses for the Pantos forwarder, hub, and PAN token
FORWARDER_ADDRESS = ""
HUB_ADDRESS = ""
PAN_ADDRESS = ""
...

for BNB Chain and 10.000 initial supply it would look like the following:

...
# Set initial token supply and minimum token stake
INITIAL_SUPPLY = 10000 * 10 ** 18  # initial supply is 10000 Token with 18 decimals
_MINIMUM_TOKEN_STAKE = 10 ** 3 * 10 ** 8

# Set the addresses for the Pantos forwarder, hub, and PAN token
FORWARDER_ADDRESS = "0x77aa11CfeD2bce4BE6d1f781077691DA1FcB6526"
HUB_ADDRESS = "0xc306ba335f4fcbe4178e3e033fc1a90c17e71831"
PAN_ADDRESS = "0xC892F1D09a7BEF98d65e7f9bD4642d36BC506441"
...

5 Deploy your token

5.1 Checking our networks

Before we start the deploy we should check our brownie networks by running:

brownie networks list

this should give us a list of all networks registered in brownie :

...
Binance Smart Chain
  ├─Testnet: bsc-test
  └─Mainnet: bsc-main
...

If you are not able to find the network you are searching for, you probably need to import it. Following that Guide helps you by doing that.

5.2 Deploy

After choosing a network and checking if enough funds are available, we can create our first token with the following command, where <name of account> should be replaced by your brownie account id from step 2 and <network name> is the id of the desired network (ie. bsc-test for bsc testnet):

brownie run ./scripts/deploy_token.py deploy_token <name of account> --network <network name>

You will be asked for a password, which you have set for your account in step 2 and then, if everything worked as expected you should see something like the following:

pandas-creator % brownie run ./scripts/deploy_token.py deploy_token accountId --network avalanche-fuji
Brownie v1.19.3 - Python development framework for Ethereum

PandasCreatorProject is the active project.

Running 'scripts/deploy_token.py::deploy_token'...
Enter password for "accountId": 
Transaction sent: 0xaf09406b8b75bf81545b1c9b08fb9fcea6d7a537e3a1a125023b11330e2f7fc9
  Gas price: 25.0 gwei   Gas limit: 1236507   Nonce: 17
  MyToken.constructor confirmed   Block: 21046119   Gas used: 1124098 (90.91%)
  MyToken deployed at: 0x2FE768060c4788122Cd3A65f1ac91CDEA0f0b8C9

Transaction sent: 0x8432dec436c8f896ddb55168d75b4ebee2d402eb6692ebf236d01c1fa9bb39d3
  Gas price: 25.0 gwei   Gas limit: 52055   Nonce: 18
  MyToken.setPantosForwarder confirmed   Block: 21046120   Gas used: 47323 (90.91%)

Transaction sent: 0xce76880dfb9374bd15df37db1daff04842ccabc7873c740e5c906e25f975becd
  Gas price: 25.0 gwei   Gas limit: 50894   Nonce: 19
  PantosToken.approve confirmed   Block: 21046123   Gas used: 46268 (90.91%)

Transaction sent: 0x32397ecedd370ca1c2d7d67317ab0907626c3e80fbc61d1653ccd51fd0acd7af
  Gas price: 25.0 gwei   Gas limit: 157894   Nonce: 20
  PantosHub.registerToken confirmed   Block: 21046124   Gas used: 141787 (89.80%)

6. Register External Token

If we have deployed our token on 2 or more chains, then we need to tell the Pantos hub how the token should be mapped. Ie. we have our token deployed on 3 chains: Avalanche, BSC and FTM. Now we need to tell the hub of each of those chains the address of the token on the other chains, in our example we would need to call 2 registerExternalToken events on each chain.

6.1 File adaptions

To perform one registration we need to change the following in our scripts/register_external_tokens.py file:

• Add the HUB_ADDRESS of our current hub, which can be found here again.
• We need to insert our data
  • <address of token on chain> = the address of token on current chain (the chain where the hub is located)
  • <chain_id> = ID of destination chain (0 = ETH, 1 = BSC, 3 = Avalanche, 5 = Polygon, 6 = Cronos, 7 = Fantom, 8 = Celo)
  • <address of token on different chain> = the address of the token of the destination chain.

hub.registerExternalToken('<address of token on chain>', '<chain id>', '<address of token on different chain>'.encode('utf-8').strip(),
            {'from': account}
    )

6.2 run registration

To run the registration we need to run the following command, where <name of account> should be replaced by your brownie account id from step 2 and <network name> is the id of the desired network (ie. bsc-test for bsc testnet):

brownie run ./scripts/register_external_tokens.py register_token <name of account> --network <network name>

You will be asked for a password, which you have set for your account in step 2 and then, if everything worked as expected you should see something like the following:

Brownie v1.19.3 - Python development framework for Ethereum

PantosPandasCreatorProject is the active project.

Running 'scripts/register_external_tokens.py::register_token'...
Enter password for "accountId": 
Transaction sent: 0x42486b717067b5cdaa6487625248fef851461998f5a70687fb3af933d9c16912
  Gas price: 25.0 gwei   Gas limit: 160167   Nonce: 27
  PantosHub.registerExternalToken confirmed   Block: 21063179   Gas used: 143838 (89.81%)

7. Unregister External Token

Sometimes we need to unregister an external token, for example to register a new one. Therefore we can use unregisterExternalToken

7.1 File adaptions

To unregister an external token we need to change the following in our scripts/unregister_external_tokens.py file:

• Add the HUB_ADDRESS of our current hub, which can be found here again.
• We need to insert our data
  • <address of token on chain> = the address of token on current chain (the chain where the hub is located)
  • <chain_id> = ID of destination chain (0 = ETH, 1 = BSC, 3 = Avalanche, 5 = Polygon, 6 = Cronos, 7 = Fantom, 8 = Celo)

7.2 revert external registration

To run the external registration revert we need to run the following command, where <name of account> should be replaced by your brownie account id from step 2 and <network name> is the id of the desired network (ie. bsc-test for bsc testnet):

brownie run ./scripts/unregister_external_tokens.py unregister_external_token <name of account> --network <network name>

You will be asked for a password, which you have set for your account in step 2 and then, if everything worked as expected you should see something like the following:

Brownie v1.19.3 - Python development framework for Ethereum

PantosPandasCreatorProject is the active project.

Running 'scripts/unregister_external_tokens.py::unregister_external_token'...
Enter password for "accountId": 
Transaction sent: 0xf62fffeca9b7d9c0ba16b507e35ea2a770047e9f37ef9ccdf54e7d904a9d26cb
  Gas price: 25.0 gwei   Gas limit: 52895   Nonce: 28
  PantosHub.unregisterExternalToken confirmed   Block: 21063498   Gas used: 47825 (90.41%)

8. Unregister Token

Sometimes we want to unregister a token, which, if run through successfully unlocks the PAN we used for registering.

8.1 File adaptions

To unregister a token we need to change the following in our scripts/unregister_token.py file:

• Add the HUB_ADDRESS of our current hub, which can be found here again.
• Add the TOKEN_ADDRESS of the token you want to unregister.

8.2 revert external registration

To run the registration revert we need to run the following command, where <name of account> should be replaced by your brownie account id from step 2 and <network name> is the id of the desired network (ie. bsc-test for bsc testnet):

brownie run ./scripts/unregister_token.py unregister_token <name of account> --network <network name>

You will be asked for a password, which you have set for your account in step 2 and then, if everything worked as expected you should see something like the following:

Brownie v1.19.3 - Python development framework for Ethereum

PantosPandasCreatorProject is the active project.

Running 'scripts/unregister_token.py::unregister_token'...
Enter password for "accountId": 
Transaction sent: 0x26d7ecea2e5dd52849ea41109820775458701fce6f93b37b63e19f917c9c52dc
  Gas price: 25.0 gwei   Gas limit: 176695   Nonce: 26
  PantosHub.unregisterToken confirmed   Block: 21063039   Gas used: 158609 (89.76%)