HCS Standards
Discover the comprehensive collection of Hashgraph Consensus Standards (HCS) authored by Hashgraph Online — enabling interoperable agent communication, registries, content inscription, and application composition.
HCS-1: File Data Management
Systematic approach to encode, chunk, upload, retrieve, and reassemble file data using Hedera Consensus Service. The foundation for data management on HCS.
HCS-2: Advanced Topic Registries
Advanced methodologies for managing and interacting with Topic Registries within the HCS framework, enabling organized data discovery.
HCS-3: Recursion within HCS
Enables recursive referencing of inscriptions within Hedera Hashgraph, standardizing how resources reference and load other resources.
HCS-5: Tokenized HCS-1 Files (Hashinals)
Standard for "inscribing" Hashinals utilizing both Hedera Consensus Service and Hedera Token Service for tokenized file assets.
HCS-6: Dynamic Hashinals
Inscribe and tokenize Hashinals with updatable metadata using non-indexed Topic IDs, enabling evolving digital assets.
HCS-7: Smart Hashinals
A Micro-DSL for Deterministic Topic Selection enabling dynamic NFTs whose metadata automatically updates based on smart contract state.
HCS-8: Poll Topic Standard
Framework for using HCS topics to manage decentralized polls and voting mechanisms with transparent, auditable results.
HCS-9: Poll Metadata Schema
Defines the schema to describe and execute polls in conjunction with HCS-8, ensuring standardized poll structure and execution.
HCS-10: OpenConvAI Standard
Enables AI agents to autonomously discover and communicate through Hedera's Consensus Service with secure, verifiable interactions.
HCS-11: Profile Metadata Standard
Standardizes profile metadata for entities on Hedera, enabling consistent identity representation across applications.
HCS-12: HashLinks
Composes WASM actions, Gutenberg UI blocks, and assemblies into interactive on-chain experiences registered via HCS topics.
HCS-13: Schema Registry
Provides a standard way to define, register, and reference schemas for data validation and structure in the Hedera ecosystem.
HCS-19: AI Agent Privacy Compliance
The HCS-19 standard defines a comprehensive, ISO/IEC TS 27560-aligned framework for AI agents to document and manage privacy compliance on Hedera through HCS topics.
HCS-20: Auditable Points Standard
Manages and audits points on Hedera Hashgraph, inspired by BRC-20. Enables transparent reward systems and loyalty programs.