# Blockchain protocol

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Numpay is built on **Solana**, a secure and high-performance blockchain designed for instant, global, and near-zero-cost payments. The Solana network provides the foundation for decentralization, transparency, and trust, without sacrificing speed or usability.

#### **Protocol Foundation**

Numpay leverages Solana’s **Layer 1 architecture**, optimized for payments and scalable applications.

* **Fast Finality:** Solana confirms transactions in seconds, enabling real-time global transfers.
* **Low or Zero Fees:** Solana’s efficient Proof-of-History and Proof-of-Stake mechanisms keep transaction fees minimal, while Numpay’s fee-payer relayers make the experience gasless for users.
* **Scalability:** Solana’s high throughput (tens of thousands of transactions per second) ensures Numpay can handle large-scale payment activity.
* **Smart Contract Support:** Custom Solana programs handle payment logic, identity resolution, compliance, and token issuance.

Numpay’s infrastructure is fully aligned with the Solana ecosystem, allowing seamless integration with its wallets, DeFi protocols, and liquidity hubs.

#### **Token Standard**

The **Numpay Token ($NUM)** follows Solana’s **SPL standard**, ensuring full compatibility with Solana wallets, decentralized exchanges, and DeFi protocols.

The token supports:

* Instant transfers and microtransactions
* Staking (where applicable)
* Governance and protocol voting
* Gas abstraction for covering transaction fees through relayers

#### **Gasless Transactions**

Numpay uses Solana’s **fee-payer model** to let users send payments without holding SOL.

* Relayer nodes act as **fee sponsors**, covering network costs.
* Users sign transactions authorizing the relayer to submit them, keeping control and security intact.
* The relayers are rewarded through the protocol’s incentive pool or staking rewards.

This setup makes Numpay simple for both crypto and non-crypto users.

#### **On-Chain Privacy & Identity**

To make transfers user-friendly without exposing private data, Numpay includes an **identity resolution layer** that:

* Links phone numbers or emails to wallet addresses through secure, hashed mappings.
* Supports one-time or reusable address associations.
* Stores sensitive mappings off-chain using encrypted data and decentralized key management.

#### **Security Features**

* **Client-Side Signing:** Every transaction is signed locally by the user’s device or wallet to ensure full control.
* **Audited Programs:** All Solana programs powering Numpay undergo third-party security reviews and formal audits.
* **Immutable Ledger:** Solana’s permanent ledger ensures full traceability and transparency.
* **Rate Limiting & Fraud Detection:** Automated protection mechanisms prevent spam, misuse, and fraudulent transactions.


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