> 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/6.-transaction-model/6.5-propagation-model-and-dag-as-mempool.md).

# 6.5 - Propagation Model & DAG-as-Mempool

Polarischain eliminates traditional mempool gossip. Pending transactions follow a **validator-local queuing model**:

* Transactions submitted to a validator’s TCP listener are enqueued only in that validator’s local consensus channel.
* Each validator includes only its local pending transactions when proposing blocks.
* Transaction visibility propagates implicitly: once a block enters the DAG, its transactions become network-visible through standard block gossip.

**Design Rationale:** This architecture reduces bandwidth spam, eliminates mempool manipulation/MEV extraction, and aligns with payment-centric workloads where shared-object contention is minimal.**Client Implications:**

* Clients should route submissions to healthy validators (queryable via `nodes_online` API).
* Duplicate submissions to multiple validators trigger nonce-based deduplication; only one inclusion succeeds.
* Partitioned validators cannot commit pending transactions; clients should retry against alternative nodes.
* TCP submit protocol (v1) provides explicit `queue-full` feedback to prevent high-frequency overload.


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