Token Deposit
=============
Check out this tutorial on GitHub: `token_deposit <https://github.com/justmert/arbitrum-python-tutorials/tree/master/tutorials/token_deposit>`__


``token_deposit`` demonstrates moving a token from a parent chain to a
child chain (e.g. from Ethereum to Arbitrum) using the standard token
gateway in Arbitrum’s token bridging system.

For info on how it works under the hood, see our `token bridging
docs <https://docs.arbitrum.io/build-decentralized-apps/token-bridging/token-bridge-erc20>`__.

Standard ERC-20 deposit
-----------------------

Depositing an ERC-20 token into an Arbitrum chain is done via our
Arbitrum token bridge.

In this tutorial, we deploy a `demo token  <https://github.com/justmert/arbitrum-python-tutorials/tree/master/tutorials/token_deposit/contracts/DappToken.sol>`__
and trigger a deposit; by default, the deposit will be routed through
the standard ERC-20 gateway, where on initial deposit, a standard arb
ERC-20 contract will automatically be deployed to the destination chain.

We use our `Arbitrum
SDK <https://github.com/justmert/arbitrum-python-sdk>`__ library to
initiate and verify the deposit.

See `exec.py  <https://github.com/justmert/arbitrum-python-tutorials/tree/master/tutorials/token_deposit/scripts/exec.py>`__ for inline explanation.

Set environment variables
-------------------------

Set the values shown in ``.env-sample`` as environmental variables. To
copy it into a ``.env`` file:

.. code:: bash

   cp .env-sample .env

You’ll still need to edit some variables, i.e., ``PRIVATE_KEY``,
``CHAIN_RPC`` and ``PARENT_CHAIN_RPC``.

Note that you can also set the environment variables in an ``.env`` file
in the root of the monorepo, which will be available in all tutorials.

Run
---

Install dependencies and build the contracts:

::

   chmod +x ./build.sh && ./build.sh

Run the script:

::

   python3 scripts/exec.py

.. raw:: html

   <p align="left">

.. raw:: html

   </p>