# Basic Core Concepts

1. **ERC-4337 Account Abstraction**
Abandon traditional EOA external accounts, adopt smart contracts as user wallets to enable social recovery, batch transactions, gas sponsorship and other customizable features.
2. **Paymaster**
A fee escrow account managed by project parties. It verifies permissions and covers on-chain gas fees for end users, enabling frictionless zero-fee user interactions.
3. **MPC Multi-party Computation Signature**
Decentralized distributed signature solution with no private key custody, balancing top-tier security and convenient login experience.

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