> ## Documentation Index
> Fetch the complete documentation index at: https://docs.debridge.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Bridging Reserve Assets

> Order creation flow and asset handling when bridging reserve assets.

This page outlines the behavior of input assets during order creation and provides a visual representation of the process for creating
an order using reserve assets.

When interacting with the `create-tx` API, the [response]() includes a `tx` field. To create an order, it is sufficient to sign the
transaction and submit it to the network. The `data` field within `tx` contains all necessary instructions for creating an order
on the source chain.

The simplest scenario occurs when bridging [reserve assets](/dln-details/dln-specifics/reserve-assets) from the source chain to the destination chain.
In this case, the order creation process on the initiator’s side consists of three distinct steps:

* Step 1: Call `create-tx` API with the required [parameters]().
* Step 2: After receiving the [response](), call `approve` on the ERC-20 contract of the [reserve assets](/dln-details/dln-specifics/reserve-assets).
  The spender should be set to `response.tx.to` value, and the approved amount should match the value specified in the transaction, with [caveats]().
  * Note: This step is required only for ERC-20 assets.
* Step 3: Sign response.tx and submit the transaction. This action locks the specified amount of [reserve assets](/dln-details/dln-specifics/reserve-assets)
  on the source chain until the order is either [claimed by a solver]() or [cancelled by an authorized entity]().

```mermaid theme={null}
sequenceDiagram
    actor User
    participant CreateTx
    participant Aggregators
    participant ERC20_Contract
    participant dln as DlnContracts
    rect rgba(230, 230, 255, .15)
        Note right of User: Get Transaction <br/> and Estimate
        User        ->> CreateTx     : get(...)
        activate CreateTx
        CreateTx    ->> Aggregators  : simulate(...)
        activate Aggregators
        Aggregators -->> CreateTx    : simulation response
        deactivate Aggregators
        CreateTx    -->> User        : response
        deactivate CreateTx
    end
    opt inputAssetType == ERC20
        User            ->> ERC20_Contract : approve(actorAddr, tx.to, amount)
        ERC20_Contract  -->> User          : approve tx receipt
    end
    User ->> User : sign response.tx
    rect rgba(240, 240, 240, .15)
        Note right of User: Create Order <br/> Transaction
        Note right of User: Atomic
        User ->> dln : submit signed response.tx
        activate dln
        opt inputAssetType == ERC20
            dln ->> ERC20_Contract : transferFrom(actorAddr, dlnAddr, amount)
        end
        dln ->> dln : finishCreatingOrder()
        deactivate dln
        dln -->> User : transaction receipt
    end
```

Once these steps are completed, the bridging process from the user's perspective is finished. The next actions involve either
[monitoring the order’s status]() or [initiating cancellation](). Additional details on how solvers fulfill the order on the destination
chain are available [here](/dln-details/dln-specifics/order-fulfillment/order-fulfillment).