# Execution Flow

This section outlines **Optimex’s swap execution process** using an example where a user swaps **BTC for ETH** while maintaining **full custody** of their BTC—without relying on intermediaries or wrapped assets.

### <mark style="color:orange;">Fixed-Rate Swap</mark>

1. **BTC Deposit & Swap Intent**
   * The user deposits BTC into the **Optimex Vault** on the Bitcoin network.
   * This deposit signals their commitment to swap, though they can reclaim their BTC after a **timelock (T)** expires (e.g., 24 hours).
2. **Quote Request & Selection**
   * The user requests quotes from **market makers (MMs)** via the **Solver**.
   * Since BTC is already in the Vault, MMs provide **competitive, market-aligned quotes**.
   * The user selects the best quote and **confirms the swap** by signing a transaction that authorizes the Vault to send BTC to the chosen MM (pending final approval).
3. **ETH Payment & Swap Settlement**
   * The MM sends the ETH payment to the user based on the agreed rate.
   * Once confirmed on-chain, the **Settlement Committee authorizes** the Vault to release BTC to the MM, completing the swap.

#### **Security Mechanisms**

If the **Validator Network or MM acts maliciously**, **Optimex** ensures fairness through:

* **Blocking BTC Release**: If the MM doesn’t send ETH, the **Settlement Committee’s security deposit** covers user losses.
* **Unauthorized BTC Transfers**: If the Committee colludes with the MM to take BTC without payment, both the **MM and the Committee** are penalized.
* **Swap Failure**: If the MM fails to fulfill the swap, part of its **security deposit is slashed** and paid as compensation to the user. The user can then reclaim BTC after the timelock expires.

### <mark style="color:orange;">Turbo Swap</mark> <mark style="color:orange;"></mark><mark style="color:orange;">**(Faster Settlements)**</mark>

The Fixed-Rate Swap **requires Bitcoin confirmations**, which can take **\~30 minutes**. To streamline execution, **Optimex enables an "Turbo Swap"**, allowing users to **pre-confirm swaps** while their BTC deposit is still pending.

1. **Indicative Quotes & Pre-Confirmation**
   * The user requests **indicative quotes** from MMs via the Solver.
   * Solver selects the best two quotes (from two MMs) and informs the User.
   * The User sets a **minimum acceptable rate** and an **expiry time** for the swap.
   * The user deposits BTC into the Vault and **pre-signs a transaction** allowing settlement to one of the selected MMs if conditions are met.
2. **Final Quote & Execution**
   * Once the BTC deposit is confirmed, the Solver fetches **committed, binding quotes** from the selected MMs.
   * If a quote meets the **user’s minimum acceptable rate**, the swap is executed immediately.

This **reduces wait times** and enables **one-shot swap execution**, improving the user experience. The **number of pre-signed market makers can be increased beyond two** for additional flexibility.<br>


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