# Scalability

Traditional blockchain architectures face two primary bottlenecks that limit scalability:

1. **Smart Contract Virtual Machines (VMs)**: Complex on-chain execution environments like Ethereum’s EVM impose computational overhead, restricting throughput.
2. **Transaction Signature Verification**: Cryptographic signature checks, especially under high load, consume significant time and resources.

PWR Chain eliminates the first bottleneck entirely by **decoupling execution from consensus**. Unlike monolithic chains, PWR Chain does not process smart contracts or host a VM on itself. Instead, Verifiable Immutable Data Applications (VIDAs) handle logic off-chain, freeing the blockchain to focus solely on ordering and securing transactions.

The remaining challenge—signature verification—is addressed through two innovations:

#### 1. **Post-Quantum Signature Efficiency**

PWR Chain uses **Falcon**, a post-quantum secure signature scheme optimized for speed. A single CPU core can verify **20,000–40,000 Falcon signatures per second** (depending on hardware), making it orders of magnitude faster than classical algorithms like ECDSA.

#### 2. **Parallelized Processing**

PWR Chain is a **multi-threaded blockchain**, enabling validators to verify signatures and process transactions in parallel across multiple CPU cores. This design ensures linear scalability:

* **1 core**: 20k–40k transactions per second (TPS).
* **16-core server (32 threads)**: Over **600k TPS** (e.g., 32 threads × 20k TPS).

Validators can dynamically scale server capacity to meet demand. For example:

* **Low-cost deployment**: A $6/month server (4 cores/8 threads) handles 160**k TPS**.
* **Enterprise-grade throughput**: A $140/month server (16 cores/32 threads) achieves **600k+ TPS**.

#### Cost Efficiency

By avoiding smart contract execution and leveraging lightweight cryptography, PWR Chain reduces operational costs to a fraction of traditional chains. Validators incur minimal expenses while supporting global-scale throughput, making PWR Chain:

* **Accessible**: Start with consumer-grade hardware.
* **Future-proof**: Scale seamlessly via horizontal server upgrades.

#### Comparison to Traditional Chains

| **Metric**         | **Ethereum** | **Solana**     | **PWR Chain**            |
| ------------------ | ------------ | -------------- | ------------------------ |
| On-chain execution | Yes (EVM)    | Yes (Sealevel) | **No** (VIDAs off-chain) |
| Signature Scheme   | ECDSA        | Ed25519        | **Falcon**               |
| Max TPS            | \~30         | \~65k          | **600k+**                |

This architecture ensures PWR Chain scales not just through VIDA parallelism but also via blockchain optimizations, making it one of the most efficient and cost-effective blockchains for high-throughput use cases.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://whitepaperv2.pwrlabs.io/scalability.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.