The on‑chain internet — open standards, tools, and research for Hashgraph Consensus Standards (hcs) .

Hashgraph Online is a consortium building the on‑chain internet on Hedera’s Consensus Service (HCS).
We author open Hashgraph Consensus Standards (HCS), ship production‑grade tooling, and support implementers across the ecosystem.

Audience: developers, protocol/standards authors, and builders moving real apps to fully on‑chain infrastructure.

# SDK
npm i @hashgraphonline/standards-sdk

# Docs
# → https://hol.org/docs/standards

Selected HCS specs used across the ecosystem:

• HCS‑1 (File Storage & Retrieval)
• HCS‑2 (Discovery Registries)
• HCS‑3 (Resource Linking & Recursion)
• HCS‑5 (Dynamic NFTs / Hashinals)
• HCS‑6 (Time‑Based Evolution)
• HCS‑8 (Governance & Voting)
• HCS‑9 (Modular Governance)
• HCS‑10 (AI Agent Communication / OpenConvAI)
• HCS‑11 (Identity Profiles)
• HCS‑13 (Schema Registry)
• HCS‑20 (Auditable Points)

Browse all standards → https://hol.org/docs/standards

• Standards & Site — hcs-improvement-proposals: canonical specs & docs.
• Standards SDK — standards-sdk: TypeScript SDK for HCS standards.
• Agent Kit — standards-agent-kit: utilities for OpenConvAI/agent apps.
• Desktop (reference app) — desktop: UI to explore and interact with on‑chain agents.

See all repositories at https://github.com/hashgraph-online.

• New or updated standard? Open a discussion/PR in hcs-improvement-proposals with motivation, spec text, and references.
• Code contributions? Use issues/PRs in the target repo; follow each repo’s CONTRIBUTING.md & CODE_OF_CONDUCT.md.
• Security reports: follow the SECURITY.md in the relevant repo.

• Telegram: https://t.me/hashinals
• X (Twitter): https://x.com/HashgraphOnline
• Brand kit (logos/colors): https://hol.org/brand
• Blog & updates: https://hol.org/blog

Unless noted otherwise, Hashgraph Online software is released under Apache‑2.0. Check each repository’s LICENSE for details.