# Wallet Abstraction and Key Management

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#### **Wallet Abstraction & Key Management**

One of Numpay’s key innovations on Solana is removing the traditional friction of crypto wallets by introducing **wallet abstraction** and secure, user-friendly **key management**. This lets users benefit from blockchain technology without needing to understand private keys, seed phrases, or wallet addresses.

#### **Wallet Abstraction**

Numpay builds a smart wallet infrastructure powered by **Solana programs** and **Web3Auth** that works quietly in the background. When a user signs up with a phone number or email, a **non-custodial Solana wallet** is automatically created and linked to their identity.

**Key features of wallet abstraction:**

* **Email/Phone-Based Access:** Users log in with familiar credentials using Web3Auth or MPC-based authentication. No wallet extensions or extra apps are required.
* **Programmable Wallets:** Each user has a smart wallet on Solana capable of enforcing spending limits, approvals, and recovery actions through custom on-chain logic.
* **Gas Sponsorship:** Numpay uses Solana’s **fee-payer model** to cover transaction fees for users, enabling gasless payments.
* **Multi-Chain Readiness:** While native to Solana, Numpay’s wallet layer can connect to other ecosystems via **Neon EVM** or **Wormhole bridges**, allowing seamless scalability.

This system ensures users never handle public or private keys directly while keeping full ownership of their assets.

#### **Key Management**

Numpay maintains decentralization and security through a **non-custodial key management framework** designed for Solana users. It keeps control in the user’s hands while removing the complexity of traditional wallet setup.

Numpay implements:

* **MPC (Multi-Party Computation):** Private keys are divided across multiple secure nodes and reconstructed only upon user authorization, removing any single point of failure.
* **Social or Biometric Recovery:** Wallet recovery can be done through trusted contacts or device-based methods like fingerprint or face authentication—no seed phrase required.
* **Encrypted Backup Storage:** Optional cloud backup encrypts and stores key shares, enabling users to restore wallets on any device safely.
* **Session Keys:** Temporary session keys allow smooth in-app transactions without repeated signing requests, improving usability while maintaining control.


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