EVM Unstake

Burns LBTC on an EVM chain and releases native 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: 'bc1q...',  // Bitcoin address
});
 
const result = await unstake.execute();
// result.txHash: EVM transaction hash

Parameters

Unstake Options

Parameter	Type	Required	Description
`sourceChain`	`Chain`	Yes	EVM chain holding LBTC
`destChain`	`Chain`	Yes	Bitcoin network (mainnet/signet)
`assetIn`	`AssetId`	Yes	`AssetId.LBTC`
`assetOut`	`AssetId`	Yes	`AssetId.BTC`

Prepare Parameters

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

Status Flow


IDLE → NEEDS_APPROVAL → READY → CONFIRMING → COMPLETED

Event Handling


import { UnstakeEvent } from '@lombard.finance/sdk';
 
unstake.on(UnstakeEvent.StatusChange, (status) => {
  console.log('Status:', status);
});
 
unstake.on(UnstakeEvent.Completed, () => {
  console.log('BTC released to recipient');
});