# Set Proxy Account via XCM

## Step 1: Encode the call

Get the encoded call via polkadot.js apps:

const ALICE = '5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY';
const addProxy = api.tx.proxy.addProxy(ALICE, "Any", 0);
const asDerivative = api.tx.utility.asDerivative(0, addProxy);
console.log("As derivative: ", asDerivative.toHex());

Note to replace account id `ALICE` and proxy type `Any`. And double check the first param of `asDerivative` (the derive index).

This will result a hex of the encoded call, something like:

0xb0045a0100005b01d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d0000000000

Remember to remove the leading module and call id, `b004` in this case, and use the rest:

0x5a0100005b01d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d0000000000

## Step 2: Make sure the proxied account exist

For homa-lite, the proxied account is derived from Karura sovereign account. Transfer some fund to it to make it alive.

## Step 3: Send the XCM message

Use `ormlXcm.sendAsSovereign` as follows. Structure of this message:

WithdrawAsset {
    ..,
    effects: vec![
        // buy execution fee
        BuyExecution {
            ..,
            xcm: vec![Xcm::Transact { .. }]
        },
        // refund fees
        DepositAsset { .. }
    ]
}

- The withdraw `amount` amount is to pay execution fees.
- `debt` field in `BuyExecution` is the weight for `Xcm::Transact`. In rococo, it's `296,569,000` for adding a proxy via derived account.
- `network` in `DepositAsset` might need to change, depending on which relay chain the message will be sent to.