Converting ERC20 to ICRC

The sequence diagram details the process involved in converting the wrapped ICRC on the EVM chains back to ICRC on IC is shown below:

ERC20 => ICRC sequence diagram

The detailed breakdown of each step in the sequence is as follows:

1. User Interaction:

   • The user initiates the bridging process by calling the bridge(target_ic, amount, recipient) function on the BitoBridge Helper smart contract.

   • The BitoBridge Helper confirms the request by sending an 'ok' response back to the user.

2. Event Emission:

   • The BitoBridge Helper emits an event Bridge(target_ic, amount, recipient, from) which is picked up by the RPC Nodes.

3. Event Listening and Processing:

   • The Minter continuously listens for events from RPC nodes. This listening process runs in a loop, with checks occurring every three minutes.

   • Once an event is detected, BitoBridge Minter gets the information.

4. BitoBridge Minter Activation:

   • Upon receiving the event data, the BitoBridge Minter processes the details and interacts with the BitoBridge Hub to initiate the token bridging process.

5. BitoBridge Hub to ICRC Ledger:

   • The BitoBridge Hub sends a request to the ICRC Ledger to bridge tokens to IC specified in the initial user request.

   • This involves the BitoBridge Hub requesting the ICRC Ledger to transfer tokens to the user's account on IC.

6. Token Transfer and Confirmation:

   • The ICRC Ledger processes the transfer request and updates the block index, which is crucial for tracking the transaction on the blockchain.

   • The ICRC Ledger confirms the successful transfer by sending the updated block index back to the BitoBridge Hub.