> For the complete documentation index, see [llms.txt](https://polarischain-1.gitbook.io/polarischain/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://polarischain-1.gitbook.io/polarischain/5.-system-architecture-and-network-economics/5.2-consensus-engine-and-state-processing.md).

# 5.2 - Consensus Engine & State Processing

The consensus engine is the core coordination layer, responsible for:

* **Block Production:** Each validator concurrently creates blocks containing transaction statements and cryptographic references to prior blocks, forming the DAG.
* **Block Validation:** Verifies Dilithium signatures, enforces DAG consistency rules, and ensures blocks reference valid predecessors before acceptance.
* **Commit Decisions:** The universal committer evaluates certified support across rounds to determine when anchor blocks meet the `2f+1` quorum threshold for commitment.
* **Linearization:** Converts committed DAG segments into a deterministic, total-ordered transaction sequence for application-layer execution.
* **Persistence & Recovery:** Writes blocks to the WAL for crash-safe journaling and to RocksDB for long-term archival. Module separation ensures high availability: the main consensus loop drives production/validation, the committer orchestrates base/pipelined waves, the linearizer orders transactions, and the network module manages validator gossip.


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