System library

This section covers Rell's system library, which provides core entities, built-in namespaces and functions, and system queries for inspecting Rell applications.

System entities

Block and transaction entities in Rell are immutable, ensuring secure, tamper-proof data storage and integrity.

Namespaces

Namespaces offer functions for blockchain data access, cryptographic operations, and meta-information retrieval within Rell modules.

Global functions

Rell includes built-in functions for math, comparisons, collection checks, error handling, cryptographic tasks, and text pattern matching.

Require function

The require function validates conditions, non-null values, and non-empty collections, throwing exceptions when conditions fail.

System queries

Learn how to inspect Rell and Postchain versions, build metadata, and your dapp structure using built-in system queries.