# Solana Transactions Overview

The Solana blockchain prioritizes ultra-fast transactions and high capacity through several innovative features. It uses [**Proof-of-History**](https://medium.com/solana-labs/proof-of-history-a-clock-for-blockchain-cf47a61a9274) for unique timestamping, the [**Turbine**](https://docs.solana.com/cluster/turbine-block-propagation) protocol for rapid block building, and parallel processing with shards to handle transactions simultaneously.

Additionally, Solana does not have an in-protocol mempool; all transactions are sent to leaders for inclusion in a block until the blockhash expires. Transactions can be routed to leaders by proxy via an RPC server or a TPU client.

<figure><img src="/files/jxQdHbJdZ8Q3bFZ6a2OF" alt=""><figcaption><p>High-level overview of a lifecycle of a Solana transaction.</p></figcaption></figure>


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