ERC-6900 is an Ethereum standard that defines Modular Smart Contract Accounts (MSCA). It extends the functionality of ERC-4337 (Account Abstraction), allowing additional logic and checks to be moved into external modules. Key aspects of ERC-6900:Modularity: allows account logic to be divided into separate plugins.Extensibility: simplifies adding new functions to accounts without changing the core code.Standardization: ensures compatibility between different implementations of accounts and plu...