EVM Unstake

Unstake LBTC to receive BTC.

---

Overview

The EVM Unstake action burns LBTC on an EVM chain and releases BTC to a Bitcoin address.

---

Basic Usage

import { createLombardSDK, Chain, AssetId } from '@lombard.finance/sdk';
import { config } from './lib/lombard';

const sdk = createLombardSDK(config);

const unstake = sdk.chain.evm.unstake({
  sourceChain: Chain.ETHEREUM,
  destChain: Chain.BITCOIN_MAINNET,
  assetIn: AssetId.LBTC,
  assetOut: AssetId.BTC,
});

await unstake.prepare({
  amount: '0.1',
  recipient: 'bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh',
});

const result = await unstake.execute();
// result.txHash: '0x...'

---

Parameters

Unstake Options

Parameter	Type	Required	Description
sourceChain	Chain	Yes	Chain where LBTC is burned
destChain	Chain	Yes	Bitcoin network
assetIn	AssetId	Yes	Input asset (AssetId.LBTC)
assetOut	AssetId	Yes	Output asset (AssetId.BTC)

Prepare Parameters

Parameter	Type	Required	Description
amount	string	Yes	Amount in LBTC
recipient	string	Yes	BTC address to receive funds

---

Status Flow

IDLE → NEEDS_APPROVAL → READY → CONFIRMING → COMPLETED

---

Checking Status

import { EvmOperationStatus } from '@lombard.finance/sdk';

if (unstake.status === EvmOperationStatus.NEEDS_APPROVAL) {
  // Token approval required
}

if (unstake.status === EvmOperationStatus.READY) {
  await unstake.execute();
}

if (unstake.status === EvmOperationStatus.CONFIRMING) {
  // Transaction submitted, waiting for confirmations
}

if (unstake.status === EvmOperationStatus.COMPLETED) {
  // Unstake complete
}

---

Events (Optional)

import { UnstakeEvent } from '@lombard.finance/sdk';

unstake.on(UnstakeEvent.StatusChange, (status) => {
  // Update UI
});

unstake.on(UnstakeEvent.Completed, () => {
  // BTC will be sent to recipient
});

---