> For the complete documentation index, see [llms.txt](https://tetrics.gitbook.io/x/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tetrics.gitbook.io/x/architecture/privacy-preservation/sealed-bid-batch-auction.md).
# Sealed-Bid Batch Auction
A **sealed-bid batch auction** is an on-chain settlement process in which multiple trades or intents are collected within a fixed time window (“batch”). Each solver submits a commit (i.e., a hash of their proposed solution) off-chain or on-chain, then later reveals the full details of their bid. The system picks the best solution and settles it atomically, ensuring fair competition and minimal front-running.
### Transaction Settlement Process
#### 1. Intent Submission & Batch Window Collection
* **Intent Submission:** Users sign and submit requests, such as trades or yield flows, within a predetermined batch window (e.g., N blocks).
* **Visibility:** Solvers can see user intents within the batch but not the specific solutions proposed by others.
* **Storage:** Intents are stored either off-chain or in a minimal on-chain structure for reference.
#### 2. Commit Phase
* **Hashing & Commitment:** Solvers compute and hash details about the routes, fees, and constraints.
* **No Copying:** Only the hash is submitted, ensuring competitors cannot see specific fees or routes.
* **Storage of Minimal Data:** Ensures reduced on-chain data usage.
#### 3. Reveal Phase
* **Disclosure:** After the commit deadline, solvers reveal the details of their solutions previously committed.
* **Comparison:** Solutions are evaluated based on fees, slippage, and yield outcomes.
* **Best Bid Selection:** Routes with the lowest fee or highest user value are chosen.
#### 4. Atomic On-Chain Execution & Settlement
* **Transaction Finalization:** The entire batch is finalized in one transaction.
* **Atomicity:** If any step fails, such as a loss of liquidity, the transaction reverts entirely.
* **Batch Settlement:** Aggregation of multiple trades reduces on-chain interactions, optimizing gas costs.
### Optimized Blockchain Operations
#### Security & Front-Running Mitigation
* **No Early Reveal:** The commit-reveal process prevents solvers from front-running or copying others' solutions, ensuring fairness.
* **Gas & Cost Efficiency:** The transaction either succeeds or reverts entirely, eliminating partial executions.
#### Fee Distribution
* **Reward for Winning Solver:** The selected solver collects a fee, and users benefit from minimized gas fees, as settlement covers multiple trades.
By adhering to these structured phases, the system ensures efficient, secure, and cost-effective transaction settlement on the blockchain.
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