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

# Withdrawals to L1

There are two ways to exit Spark and withdraw funds to Bitcoin L1: cooperative and unilateral exits.

### Cooperative Exit

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  In a cooperative exit, the user and SE work together to create a new transaction that spends directly from the deposit transaction to the user's desired Bitcoin address. This is the most efficient and cost-effective method, as it requires only a single on-chain transaction.

  1. **Transaction Creation:** The user and SE collaborate to create a transaction that spends from the deposit transaction's output directly to the user's desired Bitcoin address.
  2. **Signing:** Both the user and SE sign this transaction using their respective private keys.
  3. **Broadcasting:** The signed transaction is broadcast to the Bitcoin network.
  4. **Confirmation:** Once confirmed, the funds are available in the user's Bitcoin address.
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### Unilateral Exit

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  If the SE is unavailable or uncooperative, the user can perform a unilateral exit using the pre-signed exit transactions created during the deposit and transfer processes.

  1. **Broadcasting Branch Transaction:** The user broadcasts the branch transaction that was signed during the deposit process.
  2. **Waiting for Confirmation:** Once the branch transaction is confirmed, the user waits for the relative timelock to expire.
  3. **Broadcasting Exit Transaction:** After the timelock expires, the user broadcasts the exit transaction that was signed during the deposit or most recent transfer.
  4. **Confirmation:** Once confirmed, the funds are available in the user's Bitcoin address.
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  The unilateral exit process ensures that users always have control over their funds, even if the SE becomes unavailable or malicious. This is a critical aspect of Spark's self-custody design, providing users with the security and sovereignty that Bitcoin was designed to offer.
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