# Overview This documentation describes the shielder -- a modular shielded pool with the following characteristics: * Supports depositing and withdrawing native and ERC20 tokens into a common shielded pool, * Users within shielder have secret identifiers: ZK-IDs * Supports an optional Registrar -- a party or set of parties responsible for registering new users in the shielder by whitelisting their ZK-IDs * Supports an optional Anonymity Revoker -- a party or set of parties that have the power to deanonymize a particular user, given special circumstances. In the subsequent pages we go step by step and describe these components in detail. --- # 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://docs.alephzero.org/aleph-zero/protocol-details/shielder/overview.md?ask= ``` 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.